865486880 has 24 divisors (see below), whose sum is σ = 2044713132. Its totient is φ = 346194688.

The previous prime is 865486837. The next prime is 865486883. The reversal of 865486880 is 88684568.

It can be written as a sum of positive squares in 2 ways, for example, as 818646544 + 46840336 = 28612^2 + 6844^2 .

It is not an unprimeable number, because it can be changed into a prime (865486883) 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 3 ways as a sum of consecutive naturals, for example, 2704487 + ... + 2704806.

Almost surely, 2^865486880 is an apocalyptic number.

865486880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

865486880 is an abundant number, since it is smaller than the sum of its proper divisors (1179226252).

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

865486880 is a wasteful number, since it uses less digits than its factorization.

865486880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5409308 (or 5409300 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 53.

The square root of 865486880 is about 29419.1583836112. The cubic root of 865486880 is about 952.9866779903.

The spelling of 865486880 in words is "eight hundred sixty-five million, four hundred eighty-six thousand, eight hundred eighty".