331665424 has 40 divisors (see below), whose sum is σ = 654600960. Its totient is φ = 162758400.

The previous prime is 331665421. The next prime is 331665437. The reversal of 331665424 is 424566133.

It is a super-2 number, since 2×331665424² = 220003906954199552, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 331665424.

It is not an unprimeable number, because it can be changed into a prime (331665421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318697 + ... + 319735.

It is an arithmetic number, because the mean of its divisors is an integer number (16365024).

Almost surely, 2^331665424 is an apocalyptic number.

It is an amenable number.

331665424 is a deficient number, since it is larger than the sum of its proper divisors (322935536).

331665424 is a wasteful number, since it uses less digits than its factorization.

331665424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399 (or 1393 counting only the distinct ones).

The product of its digits is 51840, while the sum is 34.

The square root of 331665424 is about 18211.6837222702. The cubic root of 331665424 is about 692.2028763532.

The spelling of 331665424 in words is "three hundred thirty-one million, six hundred sixty-five thousand, four hundred twenty-four".