31068817990 has 24 divisors (see below), whose sum is σ = 65054301552. Its totient is φ = 10652166000.

The previous prime is 31068817973. The next prime is 31068818003. The reversal of 31068817990 is 9971886013.

It is a happy number.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31702386 + ... + 31703365.

It is an arithmetic number, because the mean of its divisors is an integer number (2710595898).

Almost surely, 2^31068817990 is an apocalyptic number.

31068817990 is an abundant number, since it is smaller than the sum of its proper divisors (33985483562).

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

31068817990 is a wasteful number, since it uses less digits than its factorization.

31068817990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63405772 (or 63405765 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 52.

The spelling of 31068817990 in words is "thirty-one billion, sixty-eight million, eight hundred seventeen thousand, nine hundred ninety".