31297215808 has 56 divisors (see below), whose sum is σ = 63622379232. Its totient is φ = 15270756864.

The previous prime is 31297215767. The next prime is 31297215809. The reversal of 31297215808 is 80851279213.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31297215809) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 424710 + ... + 492922.

Almost surely, 2^31297215808 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 31297215808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31811189616).

31297215808 is an abundant number, since it is smaller than the sum of its proper divisors (32325163424).

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

31297215808 is a wasteful number, since it uses less digits than its factorization.

31297215808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68399 (or 68389 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 31297215808 in words is "thirty-one billion, two hundred ninety-seven million, two hundred fifteen thousand, eight hundred eight".