31781962668 has 24 divisors (see below), whose sum is σ = 76162181872. Its totient is φ = 10307663424.

The previous prime is 31781962657. The next prime is 31781962697. The reversal of 31781962668 is 86626918713.

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, 35790055 + ... + 35790942.

Almost surely, 2^31781962668 is an apocalyptic number.

It is an amenable number.

31781962668 is an abundant number, since it is smaller than the sum of its proper divisors (44380219204).

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

31781962668 is a wasteful number, since it uses less digits than its factorization.

31781962668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71581041 (or 71581039 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 57.

The spelling of 31781962668 in words is "thirty-one billion, seven hundred eighty-one million, nine hundred sixty-two thousand, six hundred sixty-eight".