31984279680 has 128 divisors (see below), whose sum is σ = 102050020800. Its totient is φ = 8520765440.

The previous prime is 31984279643. The next prime is 31984279687. The reversal of 31984279680 is 8697248913.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 31984279680.

It is not an unprimeable number, because it can be changed into a prime (31984279687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2087086 + ... + 2102354.

Almost surely, 2^31984279680 is an apocalyptic number.

31984279680 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31984279680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51025010400).

31984279680 is an abundant number, since it is smaller than the sum of its proper divisors (70065741120).

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

31984279680 is a wasteful number, since it uses less digits than its factorization.

31984279680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16382 (or 16370 counting only the distinct ones).

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

The spelling of 31984279680 in words is "thirty-one billion, nine hundred eighty-four million, two hundred seventy-nine thousand, six hundred eighty".