858657872 has 20 divisors (see below), whose sum is σ = 1667729940. Its totient is φ = 428275968.

The previous prime is 858657829. The next prime is 858657887. The reversal of 858657872 is 278756858.

It can be written as a sum of positive squares in 2 ways, for example, as 829670416 + 28987456 = 28804^2 + 5384^2 .

It is a super-2 number, since 2×858657872² = 1474586682295136768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59063 + ... + 72150.

It is an arithmetic number, because the mean of its divisors is an integer number (83386497).

Almost surely, 2^858657872 is an apocalyptic number.

It is an amenable number.

858657872 is a deficient number, since it is larger than the sum of its proper divisors (809072068).

858657872 is a wasteful number, since it uses less digits than its factorization.

858657872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131630 (or 131624 counting only the distinct ones).

The product of its digits is 7526400, while the sum is 56.

The square root of 858657872 is about 29302.8645698676. The cubic root of 858657872 is about 950.4735854798.

The spelling of 858657872 in words is "eight hundred fifty-eight million, six hundred fifty-seven thousand, eight hundred seventy-two".