72656623 has 24 divisors (see below), whose sum is σ = 84481488. Its totient is φ = 62094336.

The previous prime is 72656611. The next prime is 72656651. The reversal of 72656623 is 32665627.

It is a de Polignac number, because none of the positive numbers 2^k-72656623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72656603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 311715 + ... + 311947.

It is an arithmetic number, because the mean of its divisors is an integer number (3520062).

Almost surely, 2^72656623 is an apocalyptic number.

72656623 is a deficient number, since it is larger than the sum of its proper divisors (11824865).

72656623 is a wasteful number, since it uses less digits than its factorization.

72656623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363 (or 346 counting only the distinct ones).

The product of its digits is 90720, while the sum is 37.

The square root of 72656623 is about 8523.8854403376. The cubic root of 72656623 is about 417.2775977317.

The spelling of 72656623 in words is "seventy-two million, six hundred fifty-six thousand, six hundred twenty-three".