72215812 has 12 divisors (see below), whose sum is σ = 126443520. Its totient is φ = 36089096.

The previous prime is 72215807. The next prime is 72215831. The reversal of 72215812 is 21851227.

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, 7389 + ... + 14107.

It is an arithmetic number, because the mean of its divisors is an integer number (10536960).

Almost surely, 2^72215812 is an apocalyptic number.

It is an amenable number.

72215812 is a deficient number, since it is larger than the sum of its proper divisors (54227708).

72215812 is a wasteful number, since it uses less digits than its factorization.

72215812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9410 (or 9408 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 72215812 is about 8497.9887032168. The cubic root of 72215812 is about 416.4320046836.

The spelling of 72215812 in words is "seventy-two million, two hundred fifteen thousand, eight hundred twelve".