31968378 has 96 divisors (see below), whose sum is σ = 80110080. Its totient is φ = 9434880.

The previous prime is 31968359. The next prime is 31968421. The reversal of 31968378 is 87386913.

It is a happy number.

Its product of digits (217728) is a multiple of the sum of its prime divisors (162).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 282850 + ... + 282962.

It is an arithmetic number, because the mean of its divisors is an integer number (834480).

Almost surely, 2^31968378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31968378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40055040).

31968378 is an abundant number, since it is smaller than the sum of its proper divisors (48141702).

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

31968378 is a wasteful number, since it uses less digits than its factorization.

31968378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 162 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 31968378 is about 5654.0585423216. The cubic root of 31968378 is about 317.3755992691.

The spelling of 31968378 in words is "thirty-one million, nine hundred sixty-eight thousand, three hundred seventy-eight".