865455680 has 28 divisors (see below), whose sum is σ = 2060867100. Its totient is φ = 346182144.

The previous prime is 865455677. The next prime is 865455713. The reversal of 865455680 is 86554568.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 113379904 + 752075776 = 10648^2 + 27424^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1351955 + ... + 1352594.

Almost surely, 2^865455680 is an apocalyptic number.

865455680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

865455680 is an abundant number, since it is smaller than the sum of its proper divisors (1195411420).

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

865455680 is a wasteful number, since it uses less digits than its factorization.

865455680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2704566 (or 2704556 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 47.

The square root of 865455680 is about 29418.6281121333. The cubic root of 865455680 is about 952.9752264238.

The spelling of 865455680 in words is "eight hundred sixty-five million, four hundred fifty-five thousand, six hundred eighty".