31000068 has 36 divisors (see below), whose sum is σ = 85486128. Its totient is φ = 9393840.

The previous prime is 31000063. The next prime is 31000087. The reversal of 31000068 is 86000013.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×31000068² = 1922008432009248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 31000068.

It is not an unprimeable number, because it can be changed into a prime (31000063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38746 + ... + 39537.

Almost surely, 2^31000068 is an apocalyptic number.

It is an amenable number.

31000068 is an abundant number, since it is smaller than the sum of its proper divisors (54486060).

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

31000068 is a wasteful number, since it uses less digits than its factorization.

31000068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78304 (or 78299 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 31000068 is about 5567.7704694069. The cubic root of 31000068 is about 314.1382949313.

Subtracting 31000068 from its reverse (86000013), we obtain a palindrome (54999945).

The spelling of 31000068 in words is "thirty-one million, sixty-eight", and thus it is an aban number and an uban number.