31804851636 has 96 divisors (see below), whose sum is σ = 85186805760. Its totient is φ = 10251208800.

The previous prime is 31804851599. The next prime is 31804851641. The reversal of 31804851636 is 63615840813.

31804851636 is a `hidden beast` number, since 3 + 1 + 8 + 0 + 4 + 8 + 5 + 1 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 31804851591 and 31804851600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5055685 + ... + 5061971.

It is an arithmetic number, because the mean of its divisors is an integer number (887362560).

Almost surely, 2^31804851636 is an apocalyptic number.

31804851636 is a gapful number since it is divisible by the number (36) 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 31804851636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42593402880).

31804851636 is an abundant number, since it is smaller than the sum of its proper divisors (53381954124).

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

31804851636 is a wasteful number, since it uses less digits than its factorization.

31804851636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7842 (or 7834 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 31804851636 in words is "thirty-one billion, eight hundred four million, eight hundred fifty-one thousand, six hundred thirty-six".