33072920 has 32 divisors (see below), whose sum is σ = 78332400. Its totient is φ = 12532608.

The previous prime is 33072899. The next prime is 33072947. The reversal of 33072920 is 2927033.

It is a self number, because there is not a number n which added to its sum of digits gives 33072920.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20999 + ... + 22518.

Almost surely, 2^33072920 is an apocalyptic number.

It is an amenable number.

33072920 is an abundant number, since it is smaller than the sum of its proper divisors (45259480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

33072920 is a wasteful number, since it uses less digits than its factorization.

33072920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43547 (or 43543 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 33072920 is about 5750.9060155770. The cubic root of 33072920 is about 320.9895151578.

Adding to 33072920 its reverse (2927033), we get a palindrome (35999953).

The spelling of 33072920 in words is "thirty-three million, seventy-two thousand, nine hundred twenty".