31313440004 has 96 divisors (see below), whose sum is σ = 70369689600. Its totient is φ = 12085399200.

The previous prime is 31313439973. The next prime is 31313440013. The reversal of 31313440004 is 40004431313.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1605149 + ... + 1624539.

It is an arithmetic number, because the mean of its divisors is an integer number (733017600).

Almost surely, 2^31313440004 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 31313440004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35184844800).

31313440004 is an abundant number, since it is smaller than the sum of its proper divisors (39056249596).

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

31313440004 is a wasteful number, since it uses less digits than its factorization.

31313440004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19534 (or 19518 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 31313440004 its reverse (40004431313), we get a palindrome (71317871317).

The spelling of 31313440004 in words is "thirty-one billion, three hundred thirteen million, four hundred forty thousand, four".