68723931 has 48 divisors (see below), whose sum is σ = 105338880. Its totient is φ = 39726720.

The previous prime is 68723929. The next prime is 68723947. The reversal of 68723931 is 13932786.

It is not a de Polignac number, because 68723931 - 2¹ = 68723929 is a prime.

It is a super-2 number, since 2×68723931² = 9445957384185522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 68723931.

It is not an unprimeable number, because it can be changed into a prime (68723971) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 772135 + ... + 772223.

It is an arithmetic number, because the mean of its divisors is an integer number (2194560).

Almost surely, 2^68723931 is an apocalyptic number.

68723931 is a deficient number, since it is larger than the sum of its proper divisors (36614949).

68723931 is a wasteful number, since it uses less digits than its factorization.

68723931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 165 counting only the distinct ones).

The product of its digits is 54432, while the sum is 39.

The square root of 68723931 is about 8289.9898069901. The cubic root of 68723931 is about 409.6088496362.

The spelling of 68723931 in words is "sixty-eight million, seven hundred twenty-three thousand, nine hundred thirty-one".