72579731 has 6 divisors (see below), whose sum is σ = 84429540. Its totient is φ = 62211156.

The previous prime is 72579719. The next prime is 72579769. The reversal of 72579731 is 13797527.

It is not a de Polignac number, because 72579731 - 2¹⁰ = 72578707 is a prime.

It is a super-2 number, since 2×72579731² = 10535634704064722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72579701) 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, 740561 + ... + 740658.

It is an arithmetic number, because the mean of its divisors is an integer number (14071590).

Almost surely, 2^72579731 is an apocalyptic number.

72579731 is a deficient number, since it is larger than the sum of its proper divisors (11849809).

72579731 is a wasteful number, since it uses less digits than its factorization.

72579731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481233 (or 1481226 counting only the distinct ones).

The product of its digits is 92610, while the sum is 41.

The square root of 72579731 is about 8519.3738619690. The cubic root of 72579731 is about 417.1303451119.

The spelling of 72579731 in words is "seventy-two million, five hundred seventy-nine thousand, seven hundred thirty-one".