31318364 has 48 divisors (see below), whose sum is σ = 71318016. Its totient is φ = 11668800.

The previous prime is 31318361. The next prime is 31318367. The reversal of 31318364 is 46381313.

It is an interprime number because it is at equal distance from previous prime (31318361) and next prime (31318367).

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31318361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4874 + ... + 9294.

It is an arithmetic number, because the mean of its divisors is an integer number (1485792).

Almost surely, 2^31318364 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31318364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35659008).

31318364 is an abundant number, since it is smaller than the sum of its proper divisors (39999652).

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

31318364 is a wasteful number, since it uses less digits than its factorization.

31318364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4466 (or 4464 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 31318364 is about 5596.2812652689. The cubic root of 31318364 is about 315.2097838314.

Adding to 31318364 its reverse (46381313), we get a palindrome (77699677).

The spelling of 31318364 in words is "thirty-one million, three hundred eighteen thousand, three hundred sixty-four".