31393739424 has 96 divisors (see below), whose sum is σ = 83647904256. Its totient is φ = 10307485440.

The previous prime is 31393739413. The next prime is 31393739437. The reversal of 31393739424 is 42493739313.

It is a tau number, because it is divible by the number of its divisors (96).

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, 12724239 + ... + 12726705.

It is an arithmetic number, because the mean of its divisors is an integer number (871332336).

Almost surely, 2^31393739424 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 31393739424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41823952128).

31393739424 is an abundant number, since it is smaller than the sum of its proper divisors (52254164832).

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

31393739424 is a wasteful number, since it uses less digits than its factorization.

31393739424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4418 (or 4410 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 48.

The spelling of 31393739424 in words is "thirty-one billion, three hundred ninety-three million, seven hundred thirty-nine thousand, four hundred twenty-four".