31379928 has 16 divisors (see below), whose sum is σ = 78449880. Its totient is φ = 10459968.

The previous prime is 31379923. The next prime is 31379939. The reversal of 31379928 is 82997313.

It is a self number, because there is not a number n which added to its sum of digits gives 31379928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31379923) 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, 653725 + ... + 653772.

Almost surely, 2^31379928 is an apocalyptic number.

It is an amenable number.

31379928 is an abundant number, since it is smaller than the sum of its proper divisors (47069952).

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

31379928 is a wasteful number, since it uses less digits than its factorization.

31379928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307506 (or 1307502 counting only the distinct ones).

The product of its digits is 81648, while the sum is 42.

The square root of 31379928 is about 5601.7790031382. The cubic root of 31379928 is about 315.4161896057.

The spelling of 31379928 in words is "thirty-one million, three hundred seventy-nine thousand, nine hundred twenty-eight".