80921936 has 10 divisors (see below), whose sum is σ = 156786282. Its totient is φ = 40460960.

The previous prime is 80921933. The next prime is 80921947. The reversal of 80921936 is 63912908.

It can be written as a sum of positive squares in only one way, i.e., 56911936 + 24010000 = 7544^2 + 4900^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 80921936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80921933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2528795 + ... + 2528826.

Almost surely, 2^80921936 is an apocalyptic number.

It is an amenable number.

80921936 is a deficient number, since it is larger than the sum of its proper divisors (75864346).

80921936 is a wasteful number, since it uses less digits than its factorization.

80921936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5057629 (or 5057623 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 80921936 is about 8995.6620656848. The cubic root of 80921936 is about 432.5358291678.

Subtracting from 80921936 its reverse (63912908), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 80921936 in words is "eighty million, nine hundred twenty-one thousand, nine hundred thirty-six".