72551831 has 8 divisors (see below), whose sum is σ = 79292928. Its totient is φ = 65835000.

The previous prime is 72551813. The next prime is 72551839. The reversal of 72551831 is 13815527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-72551831 is a prime.

It is a super-2 number, since 2×72551831² = 10527536362905122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72551839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506 + ... + 12056.

It is an arithmetic number, because the mean of its divisors is an integer number (9911616).

Almost surely, 2^72551831 is an apocalyptic number.

72551831 is a deficient number, since it is larger than the sum of its proper divisors (6741097).

72551831 is a wasteful number, since it uses less digits than its factorization.

72551831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12133.

The product of its digits is 8400, while the sum is 32.

The square root of 72551831 is about 8517.7362602983. The cubic root of 72551831 is about 417.0768892870.

The spelling of 72551831 in words is "seventy-two million, five hundred fifty-one thousand, eight hundred thirty-one".