331807836 has 72 divisors (see below), whose sum is σ = 827932336. Its totient is φ = 103403520.

The previous prime is 331807831. The next prime is 331807859. The reversal of 331807836 is 638708133.

It is a super-2 number, since 2×331807836² = 220192880062005792, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 331807794 and 331807803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331807831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 835590 + ... + 835986.

Almost surely, 2^331807836 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 331807836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (413966168).

331807836 is an abundant number, since it is smaller than the sum of its proper divisors (496124500).

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

331807836 is a wasteful number, since it uses less digits than its factorization.

331807836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 331807836 is about 18215.5932102142. The cubic root of 331807836 is about 692.3019359104.

The spelling of 331807836 in words is "three hundred thirty-one million, eight hundred seven thousand, eight hundred thirty-six".