31231968 has 24 divisors (see below), whose sum is σ = 81984168. Its totient is φ = 10410624.

The previous prime is 31231961. The next prime is 31232011. The reversal of 31231968 is 86913213.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162571 + ... + 162762.

It is an arithmetic number, because the mean of its divisors is an integer number (3416007).

Almost surely, 2^31231968 is an apocalyptic number.

It is an amenable number.

31231968 is an abundant number, since it is smaller than the sum of its proper divisors (50752200).

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

31231968 is a wasteful number, since it uses less digits than its factorization.

31231968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325346 (or 325338 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 31231968 is about 5588.5568799109. The cubic root of 31231968 is about 314.9196670936.

The spelling of 31231968 in words is "thirty-one million, two hundred thirty-one thousand, nine hundred sixty-eight".