72137512 has 8 divisors (see below), whose sum is σ = 135257850. Its totient is φ = 36068752.

The previous prime is 72137503. The next prime is 72137521. The reversal of 72137512 is 21573127.

It is an interprime number because it is at equal distance from previous prime (72137503) and next prime (72137521).

It can be written as a sum of positive squares in only one way, i.e., 72012196 + 125316 = 8486^2 + 354^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4508587 + ... + 4508602.

Almost surely, 2^72137512 is an apocalyptic number.

It is an amenable number.

72137512 is a deficient number, since it is larger than the sum of its proper divisors (63120338).

72137512 is a wasteful number, since it uses less digits than its factorization.

72137512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9017195 (or 9017191 counting only the distinct ones).

The product of its digits is 2940, while the sum is 28.

The square root of 72137512 is about 8493.3804812925. The cubic root of 72137512 is about 416.2814447774.

The spelling of 72137512 in words is "seventy-two million, one hundred thirty-seven thousand, five hundred twelve".