870987656 has 128 divisors (see below), whose sum is σ = 2226216960. Its totient is φ = 308966400.

The previous prime is 870987647. The next prime is 870987671. The reversal of 870987656 is 656789078.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 323291 + ... + 325973.

It is an arithmetic number, because the mean of its divisors is an integer number (17392320).

Almost surely, 2^870987656 is an apocalyptic number.

It is a pronic number, being equal to 29512×29513.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 870987656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1113108480).

870987656 is an abundant number, since it is smaller than the sum of its proper divisors (1355229304).

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

870987656 is a wasteful number, since it uses less digits than its factorization.

870987656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2755 (or 2751 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 56.

The square root of 870987656 is about 29512.4999957645. The cubic root of 870987656 is about 955.0013819046.

The spelling of 870987656 in words is "eight hundred seventy million, nine hundred eighty-seven thousand, six hundred fifty-six".