331693656 has 64 divisors (see below), whose sum is σ = 952750080. Its totient is φ = 94264320.

The previous prime is 331693651. The next prime is 331693657. The reversal of 331693656 is 656396133.

It is a super-2 number, since 2×331693656² = 220041362861292672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331693651) 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, 26920 + ... + 37256.

It is an arithmetic number, because the mean of its divisors is an integer number (14886720).

Almost surely, 2^331693656 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 331693656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (476375040).

331693656 is an abundant number, since it is smaller than the sum of its proper divisors (621056424).

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

331693656 is a wasteful number, since it uses less digits than its factorization.

331693656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10544 (or 10540 counting only the distinct ones).

The product of its digits is 262440, while the sum is 42.

The square root of 331693656 is about 18212.4588125821. The cubic root of 331693656 is about 692.2225163435. Note that the first 3 decimals are identical.

The spelling of 331693656 in words is "three hundred thirty-one million, six hundred ninety-three thousand, six hundred fifty-six".