31904390408 has 36 divisors (see below), whose sum is σ = 65764821885. Its totient is φ = 14499469600.

The previous prime is 31904390327. The next prime is 31904390437. The reversal of 31904390408 is 80409340913.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 31904389924 + 484 = 178618^2 + 22^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=126302.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5554418 + ... + 5560158.

Almost surely, 2^31904390408 is an apocalyptic number.

It is an amenable number.

31904390408 is an abundant number, since it is smaller than the sum of its proper divisors (33860431477).

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

31904390408 is an frugal number, since it uses more digits than its factorization.

31904390408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11510 (or 5754 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The spelling of 31904390408 in words is "thirty-one billion, nine hundred four million, three hundred ninety thousand, four hundred eight".