31996011840 has 224 divisors, whose sum is σ = 109764673536. Its totient is φ = 7849820160.

The previous prime is 31996011829. The next prime is 31996011841. The reversal of 31996011840 is 4811069913.

It is a junction number, because it is equal to n+sod(n) for n = 31996011792 and 31996011801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31996011841) 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, 3902145 + ... + 3910335.

It is an arithmetic number, because the mean of its divisors is an integer number (490020864).

Almost surely, 2^31996011840 is an apocalyptic number.

31996011840 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 31996011840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54882336768).

31996011840 is an abundant number, since it is smaller than the sum of its proper divisors (77768661696).

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

31996011840 is a wasteful number, since it uses less digits than its factorization.

31996011840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8537 (or 8527 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The spelling of 31996011840 in words is "thirty-one billion, nine hundred ninety-six million, eleven thousand, eight hundred forty".