72857724 has 24 divisors (see below), whose sum is σ = 170750160. Its totient is φ = 24178944.

The previous prime is 72857713. The next prime is 72857747. The reversal of 72857724 is 42775827.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10509 + ... + 16004.

It is an arithmetic number, because the mean of its divisors is an integer number (7114590).

Almost surely, 2^72857724 is an apocalyptic number.

It is an amenable number.

72857724 is an abundant number, since it is smaller than the sum of its proper divisors (97892436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72857724 is a wasteful number, since it uses less digits than its factorization.

72857724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26749 (or 26747 counting only the distinct ones).

The product of its digits is 219520, while the sum is 42.

The square root of 72857724 is about 8535.6736113795. The cubic root of 72857724 is about 417.6622272253.

The spelling of 72857724 in words is "seventy-two million, eight hundred fifty-seven thousand, seven hundred twenty-four".