68999931 has 160 divisors (see below), whose sum is σ = 148313088. Its totient is φ = 30792960.

The previous prime is 68999897. The next prime is 68999939. The reversal of 68999931 is 13999986.

It is not a de Polignac number, because 68999931 - 2⁹ = 68999419 is a prime.

It is a super-2 number, since 2×68999931² = 9521980956009522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68999939) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1864845 + ... + 1864881.

Almost surely, 2^68999931 is an apocalyptic number.

68999931 is an abundant number, since it is smaller than the sum of its proper divisors (79313157).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68999931 is a wasteful number, since it uses less digits than its factorization.

68999931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 94 counting only the distinct ones).

The product of its digits is 944784, while the sum is 54.

The square root of 68999931 is about 8306.6197096051. The cubic root of 68999931 is about 410.1564562513.

Subtracting from 68999931 its reverse (13999986), we obtain a palindrome (54999945).

It can be divided in two parts, 68 and 999931, that added together give a palindrome (999999).

The spelling of 68999931 in words is "sixty-eight million, nine hundred ninety-nine thousand, nine hundred thirty-one".