31686342236 has 24 divisors (see below), whose sum is σ = 56958335280. Its totient is φ = 15412660992.

The previous prime is 31686342221. The next prime is 31686342257. The reversal of 31686342236 is 63224368613.

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, 1380260 + ... + 1403028.

It is an arithmetic number, because the mean of its divisors is an integer number (2373263970).

Almost surely, 2^31686342236 is an apocalyptic number.

It is an amenable number.

31686342236 is a deficient number, since it is larger than the sum of its proper divisors (25271993044).

31686342236 is a wasteful number, since it uses less digits than its factorization.

31686342236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32213 (or 32211 counting only the distinct ones).

The product of its digits is 746496, while the sum is 44.

The spelling of 31686342236 in words is "thirty-one billion, six hundred eighty-six million, three hundred forty-two thousand, two hundred thirty-six".