31609920008 has 32 divisors (see below), whose sum is σ = 59909303160. Its totient is φ = 15634268160.

The previous prime is 31609919993. The next prime is 31609920091. The reversal of 31609920008 is 80002990613.

It can be written as a sum of positive squares in 4 ways, for example, as 23567776324 + 8042143684 = 153518^2 + 89678^2 .

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, 1754888 + ... + 1772808.

Almost surely, 2^31609920008 is an apocalyptic number.

It is an amenable number.

31609920008 is a deficient number, since it is larger than the sum of its proper divisors (28299383152).

31609920008 is a wasteful number, since it uses less digits than its factorization.

31609920008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20297 (or 20293 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 31609920008 in words is "thirty-one billion, six hundred nine million, nine hundred twenty thousand, eight".