80576721 has 16 divisors (see below), whose sum is σ = 119548800. Its totient is φ = 53638704.

The previous prime is 80576677. The next prime is 80576723. The reversal of 80576721 is 12767508.

80576721 is a `hidden beast` number, since 80 + 576 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 80576721 - 2⁷ = 80576593 is a prime.

It is a super-2 number, since 2×80576721² = 12985215934223682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80576723) 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 in 15 ways as a sum of consecutive naturals, for example, 20875 + ... + 24431.

It is an arithmetic number, because the mean of its divisors is an integer number (7471800).

Almost surely, 2^80576721 is an apocalyptic number.

It is an amenable number.

80576721 is a deficient number, since it is larger than the sum of its proper divisors (38972079).

80576721 is a wasteful number, since it uses less digits than its factorization.

80576721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4405 (or 4399 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 80576721 is about 8976.4536984268. The cubic root of 80576721 is about 431.9198829050.

The spelling of 80576721 in words is "eighty million, five hundred seventy-six thousand, seven hundred twenty-one".