31756243116 has 72 divisors (see below), whose sum is σ = 80282934480. Its totient is φ = 9765460224.

The previous prime is 31756243097. The next prime is 31756243157. The reversal of 31756243116 is 61134265713.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4646790 + ... + 4653618.

Almost surely, 2^31756243116 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31756243116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40141467240).

31756243116 is an abundant number, since it is smaller than the sum of its proper divisors (48526691364).

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

31756243116 is a wasteful number, since it uses less digits than its factorization.

31756243116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9155 (or 9140 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

The spelling of 31756243116 in words is "thirty-one billion, seven hundred fifty-six million, two hundred forty-three thousand, one hundred sixteen".