31808990136 has 288 divisors, whose sum is σ = 104974410240. Its totient is φ = 7994448000.

The previous prime is 31808990119. The next prime is 31808990159. The reversal of 31808990136 is 63109980813.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4407571 + ... + 4414781.

It is an arithmetic number, because the mean of its divisors is an integer number (364494480).

Almost surely, 2^31808990136 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 31808990136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52487205120).

31808990136 is an abundant number, since it is smaller than the sum of its proper divisors (73165420104).

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

31808990136 is a wasteful number, since it uses less digits than its factorization.

31808990136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7287 (or 7265 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 48.

The spelling of 31808990136 in words is "thirty-one billion, eight hundred eight million, nine hundred ninety thousand, one hundred thirty-six".