80561864 has 16 divisors (see below), whose sum is σ = 151217820. Its totient is φ = 40237120.

The previous prime is 80561863. The next prime is 80561869. The reversal of 80561864 is 46816508.

It can be written as a sum of positive squares in 2 ways, for example, as 42640900 + 37920964 = 6530^2 + 6158^2 .

It is not an unprimeable number, because it can be changed into a prime (80561863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3134 + ... + 13074.

Almost surely, 2^80561864 is an apocalyptic number.

It is an amenable number.

80561864 is a deficient number, since it is larger than the sum of its proper divisors (70655956).

80561864 is a wasteful number, since it uses less digits than its factorization.

80561864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10960 (or 10956 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 80561864 is about 8975.6261062948. The cubic root of 80561864 is about 431.8933350053.

The spelling of 80561864 in words is "eighty million, five hundred sixty-one thousand, eight hundred sixty-four".