870643748500856 has 64 divisors (see below), whose sum is σ = 1826020479840480. Its totient is φ = 385807108078080.

The previous prime is 870643748500817. The next prime is 870643748500919. The reversal of 870643748500856 is 658005847346078.

It is a self number, because there is not a number n which added to its sum of digits gives 870643748500856.

It is a congruent number.

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, 593768351 + ... + 595232846.

Almost surely, 2^{870643748500856} is an apocalyptic number.

It is an amenable number.

870643748500856 is an abundant number, since it is smaller than the sum of its proper divisors (955376731339624).

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

870643748500856 is a wasteful number, since it uses less digits than its factorization.

870643748500856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189001424 (or 1189001420 counting only the distinct ones).

The product of its (nonzero) digits is 1083801600, while the sum is 71.

The spelling of 870643748500856 in words is "eight hundred seventy trillion, six hundred forty-three billion, seven hundred forty-eight million, five hundred thousand, eight hundred fifty-six".