865765560 has 64 divisors (see below), whose sum is σ = 2833418880. Its totient is φ = 209882240.

The previous prime is 865765529. The next prime is 865765561. The reversal of 865765560 is 65567568.

It is a super-2 number, since 2×865765560² = 1499100009764227200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865765561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 326622 + ... + 329261.

It is an arithmetic number, because the mean of its divisors is an integer number (44272170).

Almost surely, 2^865765560 is an apocalyptic number.

It is an amenable number.

865765560 is an abundant number, since it is smaller than the sum of its proper divisors (1967653320).

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

865765560 is a wasteful number, since it uses less digits than its factorization.

865765560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655908 (or 655904 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 48.

The square root of 865765560 is about 29423.8943717517. The cubic root of 865765560 is about 953.0889517639.

The spelling of 865765560 in words is "eight hundred sixty-five million, seven hundred sixty-five thousand, five hundred sixty".