72697913 has 4 divisors (see below), whose sum is σ = 72729168. Its totient is φ = 72666660.

The previous prime is 72697897. The next prime is 72697921. The reversal of 72697913 is 31979627.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72697913 - 2⁴ = 72697897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72697013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11831 + ... + 16892.

It is an arithmetic number, because the mean of its divisors is an integer number (18182292).

Almost surely, 2^72697913 is an apocalyptic number.

It is an amenable number.

72697913 is a deficient number, since it is larger than the sum of its proper divisors (31255).

72697913 is a wasteful number, since it uses less digits than its factorization.

72697913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31254.

The product of its digits is 142884, while the sum is 44.

The square root of 72697913 is about 8526.3071138682. The cubic root of 72697913 is about 417.3566275965.

The spelling of 72697913 in words is "seventy-two million, six hundred ninety-seven thousand, nine hundred thirteen".