31990735944 has 128 divisors (see below), whose sum is σ = 91878220800. Its totient is φ = 10302888960.

The previous prime is 31990735943. The next prime is 31990735951. The reversal of 31990735944 is 44953709913.

It is a happy number.

It is a super-2 number, since 2×31990735944² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (31990735943) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4529664 + ... + 4536720.

It is an arithmetic number, because the mean of its divisors is an integer number (717798600).

Almost surely, 2^31990735944 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 31990735944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45939110400).

31990735944 is an abundant number, since it is smaller than the sum of its proper divisors (59887484856).

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

31990735944 is a wasteful number, since it uses less digits than its factorization.

31990735944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7780 (or 7770 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 54.

The spelling of 31990735944 in words is "thirty-one billion, nine hundred ninety million, seven hundred thirty-five thousand, nine hundred forty-four".