72738615 has 16 divisors (see below), whose sum is σ = 117301248. Its totient is φ = 38487456.

The previous prime is 72738613. The next prime is 72738623. The reversal of 72738615 is 51683727.

It is not a de Polignac number, because 72738615 - 2¹ = 72738613 is a prime.

It is a super-2 number, since 2×72738615² = 10581812224236450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72738613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17187 + ... + 20996.

It is an arithmetic number, because the mean of its divisors is an integer number (7331328).

Almost surely, 2^72738615 is an apocalyptic number.

72738615 is a deficient number, since it is larger than the sum of its proper divisors (44562633).

72738615 is a wasteful number, since it uses less digits than its factorization.

72738615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38318.

The product of its digits is 70560, while the sum is 39.

The square root of 72738615 is about 8528.6936279831. The cubic root of 72738615 is about 417.4345027353.

The spelling of 72738615 in words is "seventy-two million, seven hundred thirty-eight thousand, six hundred fifteen".