870991245 has 32 divisors (see below), whose sum is σ = 1573827840. Its totient is φ = 456909120.

The previous prime is 870991213. The next prime is 870991259. The reversal of 870991245 is 542199078.

It is not a de Polignac number, because 870991245 - 2⁵ = 870991213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 870991245.

It is a congruent number.

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, 44649 + ... + 61118.

It is an arithmetic number, because the mean of its divisors is an integer number (49182120).

Almost surely, 2^870991245 is an apocalyptic number.

It is an amenable number.

870991245 is a deficient number, since it is larger than the sum of its proper divisors (702836595).

870991245 is a wasteful number, since it uses less digits than its factorization.

870991245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105842 (or 105836 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 870991245 is about 29512.5608004456. The cubic root of 870991245 is about 955.0026936320.

The spelling of 870991245 in words is "eight hundred seventy million, nine hundred ninety-one thousand, two hundred forty-five".