31890976806 has 16 divisors (see below), whose sum is σ = 68688257904. Its totient is φ = 9812608224.

The previous prime is 31890976769. The next prime is 31890976849. The reversal of 31890976806 is 60867909813.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204429261 + ... + 204429416.

It is an arithmetic number, because the mean of its divisors is an integer number (4293016119).

Almost surely, 2^31890976806 is an apocalyptic number.

31890976806 is an abundant number, since it is smaller than the sum of its proper divisors (36797281098).

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

31890976806 is a wasteful number, since it uses less digits than its factorization.

31890976806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408858695.

The product of its (nonzero) digits is 3919104, while the sum is 57.

The spelling of 31890976806 in words is "thirty-one billion, eight hundred ninety million, nine hundred seventy-six thousand, eight hundred six".