80921736 has 72 divisors (see below), whose sum is σ = 254955870. Its totient is φ = 23119488.

The previous prime is 80921723. The next prime is 80921759. The reversal of 80921736 is 63712908.

It can be written as a sum of positive squares in only one way, i.e., 75585636 + 5336100 = 8694^2 + 2310^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 14.

It is a zygodrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 80921736.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7941 + ... + 14996.

Almost surely, 2^80921736 is an apocalyptic number.

It is an amenable number.

80921736 is an abundant number, since it is smaller than the sum of its proper divisors (174034134).

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

80921736 is a wasteful number, since it uses less digits than its factorization.

80921736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22963 (or 22949 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 80921736 is about 8995.6509492087. The cubic root of 80921736 is about 432.5354728275.

The spelling of 80921736 in words is "eighty million, nine hundred twenty-one thousand, seven hundred thirty-six".