31840811808 has 96 divisors (see below), whose sum is σ = 90173393856. Its totient is φ = 9779555328.

The previous prime is 31840811803. The next prime is 31840811831. The reversal of 31840811808 is 80811804813.

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

It is a self number, because there is not a number n which added to its sum of digits gives 31840811808.

It is not an unprimeable number, because it can be changed into a prime (31840811803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 679966 + ... + 725282.

It is an arithmetic number, because the mean of its divisors is an integer number (939306186).

Almost surely, 2^31840811808 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 31840811808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45086696928).

31840811808 is an abundant number, since it is smaller than the sum of its proper divisors (58332582048).

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

31840811808 is a wasteful number, since it uses less digits than its factorization.

31840811808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45906 (or 45898 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 42.

The spelling of 31840811808 in words is "thirty-one billion, eight hundred forty million, eight hundred eleven thousand, eight hundred eight".