331668402 has 64 divisors (see below), whose sum is σ = 759507840. Its totient is φ = 95652864.

The previous prime is 331668397. The next prime is 331668413. The reversal of 331668402 is 204866133.

It is a super-2 number, since 2×331668402² = 220007857770467208, which contains 22 as substring.

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, 515493 + ... + 516135.

It is an arithmetic number, because the mean of its divisors is an integer number (11867310).

Almost surely, 2^331668402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 331668402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (379753920).

331668402 is an abundant number, since it is smaller than the sum of its proper divisors (427839438).

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

331668402 is a wasteful number, since it uses less digits than its factorization.

331668402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 331668402 is about 18211.7654827861. The cubic root of 331668402 is about 692.2049480936.

The spelling of 331668402 in words is "three hundred thirty-one million, six hundred sixty-eight thousand, four hundred two".