72636831 has 18 divisors (see below), whose sum is σ = 108959552. Its totient is φ = 48420180.

The previous prime is 72636821. The next prime is 72636853. The reversal of 72636831 is 13863627.

It is a happy number.

It is not a de Polignac number, because 72636831 - 2¹³ = 72628639 is a prime.

It is a super-2 number, since 2×72636831² = 10552218435445122, 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 (72636821) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1026 + ... + 12096.

Almost surely, 2^72636831 is an apocalyptic number.

72636831 is a deficient number, since it is larger than the sum of its proper divisors (36322721).

72636831 is an frugal number, since it uses more digits than its factorization.

72636831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11095 (or 11074 counting only the distinct ones).

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

The square root of 72636831 is about 8522.7243883631. The cubic root of 72636831 is about 417.2397048419.

The spelling of 72636831 in words is "seventy-two million, six hundred thirty-six thousand, eight hundred thirty-one".