815876872 has 32 divisors (see below), whose sum is σ = 1611741600. Its totient is φ = 386118144.

The previous prime is 815876863. The next prime is 815876909. The reversal of 815876872 is 278678518.

It is a happy number.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256363 + ... + 259525.

It is an arithmetic number, because the mean of its divisors is an integer number (50366925).

Almost surely, 2^815876872 is an apocalyptic number.

It is an amenable number.

815876872 is a deficient number, since it is larger than the sum of its proper divisors (795864728).

815876872 is a wasteful number, since it uses less digits than its factorization.

815876872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4885 (or 4881 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 52.

The square root of 815876872 is about 28563.5584617883. The cubic root of 815876872 is about 934.4187421229.

The spelling of 815876872 in words is "eight hundred fifteen million, eight hundred seventy-six thousand, eight hundred seventy-two".