1215636872 has 32 divisors (see below), whose sum is σ = 2411400000. Its totient is φ = 572920128.

The previous prime is 1215636869. The next prime is 1215636899. The reversal of 1215636872 is 2786365121.

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, 10154 + ... + 50342.

It is an arithmetic number, because the mean of its divisors is an integer number (75356250).

Almost surely, 2^1215636872 is an apocalyptic number.

It is an amenable number.

1215636872 is a deficient number, since it is larger than the sum of its proper divisors (1195763128).

1215636872 is a wasteful number, since it uses less digits than its factorization.

1215636872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40413 (or 40409 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 1215636872 is about 34865.9844547662. The cubic root of 1215636872 is about 1067.2544020521.

The spelling of 1215636872 in words is "one billion, two hundred fifteen million, six hundred thirty-six thousand, eight hundred seventy-two".