72113631 has 4 divisors (see below), whose sum is σ = 96151512. Its totient is φ = 48075752.

The previous prime is 72113621. The next prime is 72113647. The reversal of 72113631 is 13631127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72113631 - 2⁵ = 72113599 is a prime.

It is a super-2 number, since 2×72113631² = 10400751552008322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72113621) 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, 12018936 + ... + 12018941.

It is an arithmetic number, because the mean of its divisors is an integer number (24037878).

Almost surely, 2^72113631 is an apocalyptic number.

72113631 is a deficient number, since it is larger than the sum of its proper divisors (24037881).

72113631 is a wasteful number, since it uses less digits than its factorization.

72113631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24037880.

The product of its digits is 756, while the sum is 24.

The square root of 72113631 is about 8491.9745053786. The cubic root of 72113631 is about 416.2355032872.

Adding to 72113631 its reverse (13631127), we get a palindrome (85744758).

The spelling of 72113631 in words is "seventy-two million, one hundred thirteen thousand, six hundred thirty-one".