80815761 has 24 divisors (see below), whose sum is σ = 126886760. Its totient is φ = 49268736.

The previous prime is 80815753. The next prime is 80815771. The reversal of 80815761 is 16751808.

80815761 is a `hidden beast` number, since 8 + 0 + 81 + 576 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3920400 + 76895361 = 1980^2 + 8769^2 .

It is not a de Polignac number, because 80815761 - 2³ = 80815753 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (80815711) 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 23 ways as a sum of consecutive naturals, for example, 9585 + ... + 15921.

Almost surely, 2^80815761 is an apocalyptic number.

It is an amenable number.

80815761 is a deficient number, since it is larger than the sum of its proper divisors (46070999).

80815761 is a wasteful number, since it uses less digits than its factorization.

80815761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6465 (or 6462 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 80815761 is about 8989.7586730679. The cubic root of 80815761 is about 432.3465743793.

The spelling of 80815761 in words is "eighty million, eight hundred fifteen thousand, seven hundred sixty-one".