724572731 has 4 divisors (see below), whose sum is σ = 728214000. Its totient is φ = 720931464.

The previous prime is 724572721. The next prime is 724572757. The reversal of 724572731 is 137275427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137275427 = 139 ⋅987593.

It is a cyclic number.

It is not a de Polignac number, because 724572731 - 2²² = 720378427 is a prime.

It is a super-2 number, since 2×724572731² = 1050011285017596722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (724572721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1820336 + ... + 1820733.

It is an arithmetic number, because the mean of its divisors is an integer number (182053500).

Almost surely, 2^724572731 is an apocalyptic number.

724572731 is a deficient number, since it is larger than the sum of its proper divisors (3641269).

724572731 is a wasteful number, since it uses less digits than its factorization.

724572731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641268.

The product of its digits is 82320, while the sum is 38.

The square root of 724572731 is about 26917.8886802067. Note that the first 3 decimals coincide. The cubic root of 724572731 is about 898.1743778869.

The spelling of 724572731 in words is "seven hundred twenty-four million, five hundred seventy-two thousand, seven hundred thirty-one".