72707631 has 4 divisors (see below), whose sum is σ = 96943512. Its totient is φ = 48471752.

The previous prime is 72707629. The next prime is 72707651. The reversal of 72707631 is 13670727.

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 72707631 - 2¹ = 72707629 is a prime.

It is a super-2 number, since 2×72707631² = 10572799211264322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72707592 and 72707601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72707651) 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, 12117936 + ... + 12117941.

It is an arithmetic number, because the mean of its divisors is an integer number (24235878).

Almost surely, 2^72707631 is an apocalyptic number.

72707631 is a deficient number, since it is larger than the sum of its proper divisors (24235881).

72707631 is a wasteful number, since it uses less digits than its factorization.

72707631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24235880.

The product of its (nonzero) digits is 12348, while the sum is 33.

The square root of 72707631 is about 8526.8769781204. The cubic root of 72707631 is about 417.3752236874.

The spelling of 72707631 in words is "seventy-two million, seven hundred seven thousand, six hundred thirty-one".