31836881616 has 80 divisors (see below), whose sum is σ = 85155442560. Its totient is φ = 10237427200.

The previous prime is 31836881599. The next prime is 31836881623. The reversal of 31836881616 is 61618863813.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 1693066 + ... + 1711766.

It is an arithmetic number, because the mean of its divisors is an integer number (1064443032).

Almost surely, 2^31836881616 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 31836881616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42577721280).

31836881616 is an abundant number, since it is smaller than the sum of its proper divisors (53318560944).

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

31836881616 is a wasteful number, since it uses less digits than its factorization.

31836881616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19964 (or 19958 counting only the distinct ones).

The product of its digits is 995328, while the sum is 51.

The spelling of 31836881616 in words is "thirty-one billion, eight hundred thirty-six million, eight hundred eighty-one thousand, six hundred sixteen".