72572013 has 6 divisors (see below), whose sum is σ = 104826254. Its totient is φ = 48381336.

The previous prime is 72571987. The next prime is 72572029. The reversal of 72572013 is 31027527.

It can be written as a sum of positive squares in only one way, i.e., 37785609 + 34786404 = 6147^2 + 5898^2 .

It is not a de Polignac number, because 72572013 - 2⁹ = 72571501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72572083) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4031770 + ... + 4031787.

Almost surely, 2^72572013 is an apocalyptic number.

It is an amenable number.

72572013 is a deficient number, since it is larger than the sum of its proper divisors (32254241).

72572013 is a wasteful number, since it uses less digits than its factorization.

72572013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8063563 (or 8063560 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 72572013 is about 8518.9208823653. The cubic root of 72572013 is about 417.1155589538.

The spelling of 72572013 in words is "seventy-two million, five hundred seventy-two thousand, thirteen".