861895560 has 64 divisors (see below), whose sum is σ = 2698116480. Its totient is φ = 219845120.

The previous prime is 861895553. The next prime is 861895579. The reversal of 861895560 is 65598168.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153381 + ... + 158900.

It is an arithmetic number, because the mean of its divisors is an integer number (42158070).

Almost surely, 2^861895560 is an apocalyptic number.

It is an amenable number.

861895560 is an abundant number, since it is smaller than the sum of its proper divisors (1836220920).

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

861895560 is a wasteful number, since it uses less digits than its factorization.

861895560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312318 (or 312314 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 48.

The square root of 861895560 is about 29358.0578376704. The cubic root of 861895560 is about 951.6667177168. Note that the first 3 decimals are identical.

The spelling of 861895560 in words is "eight hundred sixty-one million, eight hundred ninety-five thousand, five hundred sixty".