31312344 has 64 divisors (see below), whose sum is σ = 92563200. Its totient is φ = 8636544.

The previous prime is 31312327. The next prime is 31312363. The reversal of 31312344 is 44321313.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 31312344.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1659 + ... + 8085.

It is an arithmetic number, because the mean of its divisors is an integer number (1446300).

Almost surely, 2^31312344 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 31312344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46281600).

31312344 is an abundant number, since it is smaller than the sum of its proper divisors (61250856).

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

31312344 is a wasteful number, since it uses less digits than its factorization.

31312344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6472 (or 6468 counting only the distinct ones).

The product of its digits is 864, while the sum is 21.

The square root of 31312344 is about 5595.7433822505. The cubic root of 31312344 is about 315.1895860491.

Adding to 31312344 its reverse (44321313), we get a palindrome (75633657).

The spelling of 31312344 in words is "thirty-one million, three hundred twelve thousand, three hundred forty-four".