215972972 has 24 divisors (see below), whose sum is σ = 383500656. Its totient is φ = 106408448.

The previous prime is 215972971. The next prime is 215972989. The reversal of 215972972 is 279279512.

215972972 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (215972971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196328 + ... + 197424.

It is an arithmetic number, because the mean of its divisors is an integer number (15979194).

Almost surely, 2^215972972 is an apocalyptic number.

It is an amenable number.

215972972 is a deficient number, since it is larger than the sum of its proper divisors (167527684).

215972972 is a wasteful number, since it uses less digits than its factorization.

215972972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777 (or 1775 counting only the distinct ones).

The product of its digits is 158760, while the sum is 44.

The square root of 215972972 is about 14696.0189166999. The cubic root of 215972972 is about 599.9749730302.

The spelling of 215972972 in words is "two hundred fifteen million, nine hundred seventy-two thousand, nine hundred seventy-two".