31316408320 has 192 divisors, whose sum is σ = 79252992000. Its totient is φ = 11858903040.

The previous prime is 31316408309. The next prime is 31316408327. The reversal of 31316408320 is 2380461313.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31316408327) 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, 14918631 + ... + 14920729.

It is an arithmetic number, because the mean of its divisors is an integer number (412776000).

Almost surely, 2^31316408320 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 31316408320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39626496000).

31316408320 is an abundant number, since it is smaller than the sum of its proper divisors (47936583680).

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

31316408320 is a wasteful number, since it uses less digits than its factorization.

31316408320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2204 (or 2184 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 31316408320 its reverse (2380461313), we get a palindrome (33696869633).

The spelling of 31316408320 in words is "thirty-one billion, three hundred sixteen million, four hundred eight thousand, three hundred twenty".