31387468 has 48 divisors (see below), whose sum is σ = 67737600. Its totient is φ = 12424320.

The previous prime is 31387453. The next prime is 31387513. The reversal of 31387468 is 86478313.

It is a self number, because there is not a number n which added to its sum of digits gives 31387468.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21093 + ... + 22531.

It is an arithmetic number, because the mean of its divisors is an integer number (1411200).

Almost surely, 2^31387468 is an apocalyptic number.

31387468 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31387468, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33868800).

31387468 is an abundant number, since it is smaller than the sum of its proper divisors (36350132).

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

31387468 is a wasteful number, since it uses less digits than its factorization.

31387468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510 (or 1508 counting only the distinct ones).

The product of its digits is 96768, while the sum is 40.

The square root of 31387468 is about 5602.4519632033. The cubic root of 31387468 is about 315.4414504201.

The spelling of 31387468 in words is "thirty-one million, three hundred eighty-seven thousand, four hundred sixty-eight".