865564080 has 80 divisors (see below), whose sum is σ = 2687161344. Its totient is φ = 230480640.

The previous prime is 865564039. The next prime is 865564097. The reversal of 865564080 is 80465568.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192417 + ... + 196863.

Almost surely, 2^865564080 is an apocalyptic number.

865564080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

865564080 is an abundant number, since it is smaller than the sum of its proper divisors (1821597264).

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

865564080 is a wasteful number, since it uses less digits than its factorization.

865564080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5274 (or 5268 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The square root of 865564080 is about 29420.4704245190. The cubic root of 865564080 is about 953.0150120936.

The spelling of 865564080 in words is "eight hundred sixty-five million, five hundred sixty-four thousand, eighty".