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33 (number)

From Wikipedia, the free encyclopedia
33 (thirty-three) is the natural number following 32 and preceding 34.

33 is the largest positive integer that can not be expressed as a sum of different triangular numbers. It is also the smallest odd repdigit that's not prime (unless we consider 1-digit integers to also be repdigits).

The sum of the first four factorials is 33. Adding up the sums of divisors for the 1 through 6 yields 33. 33 is the smallest integer such that it and the next two integers all have the same number of divisors.

33 is also the atomic number of arsenic.

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