31785744172 has 48 divisors (see below), whose sum is σ = 68476871232. Its totient is φ = 12571776000.

The previous prime is 31785744121. The next prime is 31785744191. The reversal of 31785744172 is 27144758713.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2542128 + ... + 2554600.

It is an arithmetic number, because the mean of its divisors is an integer number (1426601484).

Almost surely, 2^31785744172 is an apocalyptic number.

It is an amenable number.

31785744172 is an abundant number, since it is smaller than the sum of its proper divisors (36691127060).

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

31785744172 is a wasteful number, since it uses less digits than its factorization.

31785744172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19498 (or 19496 counting only the distinct ones).

The product of its digits is 1317120, while the sum is 49.

The spelling of 31785744172 in words is "thirty-one billion, seven hundred eighty-five million, seven hundred forty-four thousand, one hundred seventy-two".