71724731 has 16 divisors (see below), whose sum is σ = 81607680. Its totient is φ = 62566560.

The previous prime is 71724701. The next prime is 71724749. The reversal of 71724731 is 13742717.

It is a cyclic number.

It is not a de Polignac number, because 71724731 - 2¹⁴ = 71708347 is a prime.

It is a super-2 number, since 2×71724731² = 10288874074044722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71724701) 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, 15260 + ... + 19398.

It is an arithmetic number, because the mean of its divisors is an integer number (5100480).

Almost surely, 2^71724731 is an apocalyptic number.

71724731 is a deficient number, since it is larger than the sum of its proper divisors (9882949).

71724731 is a wasteful number, since it uses less digits than its factorization.

71724731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4226.

The product of its digits is 8232, while the sum is 32.

The square root of 71724731 is about 8469.0454597906. The cubic root of 71724731 is about 415.4859184592.

The spelling of 71724731 in words is "seventy-one million, seven hundred twenty-four thousand, seven hundred thirty-one".