31647742464 has 160 divisors (see below), whose sum is σ = 95577007680. Its totient is φ = 9225142272.

The previous prime is 31647742459. The next prime is 31647742507. The reversal of 31647742464 is 46424774613.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 337684 + ... + 421100.

It is an arithmetic number, because the mean of its divisors is an integer number (597356298).

Almost surely, 2^31647742464 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 31647742464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47788503840).

31647742464 is an abundant number, since it is smaller than the sum of its proper divisors (63929265216).

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

31647742464 is a wasteful number, since it uses less digits than its factorization.

31647742464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83470 (or 83454 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 48.

The spelling of 31647742464 in words is "thirty-one billion, six hundred forty-seven million, seven hundred forty-two thousand, four hundred sixty-four".