72964431 has 6 divisors (see below), whose sum is σ = 105393080. Its totient is φ = 48642948.

The previous prime is 72964429. The next prime is 72964447. The reversal of 72964431 is 13446927.

72964431 is a `hidden beast` number, since 7 + 2 + 9 + 644 + 3 + 1 = 666.

It is not a de Polignac number, because 72964431 - 2¹ = 72964429 is a prime.

It is a super-2 number, since 2×72964431² = 10647616382307522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72964231) 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, 4053571 + ... + 4053588.

Almost surely, 2^72964431 is an apocalyptic number.

72964431 is a deficient number, since it is larger than the sum of its proper divisors (32428649).

72964431 is a wasteful number, since it uses less digits than its factorization.

72964431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8107165 (or 8107162 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 72964431 is about 8541.9219734203. The cubic root of 72964431 is about 417.8660296535.

The spelling of 72964431 in words is "seventy-two million, nine hundred sixty-four thousand, four hundred thirty-one".