331861660 has 48 divisors (see below), whose sum is σ = 752042592. Its totient is φ = 122284800.

The previous prime is 331861637. The next prime is 331861679. The reversal of 331861660 is 66168133.

It is a happy number.

It is a super-2 number, since 2×331861660² = 220264322755911200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 170895 + ... + 172825.

It is an arithmetic number, because the mean of its divisors is an integer number (15667554).

Almost surely, 2^331861660 is an apocalyptic number.

It is an amenable number.

331861660 is an abundant number, since it is smaller than the sum of its proper divisors (420180932).

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

331861660 is a wasteful number, since it uses less digits than its factorization.

331861660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2614 (or 2612 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 331861660 is about 18217.0705658182. The cubic root of 331861660 is about 692.3393676612.

The spelling of 331861660 in words is "three hundred thirty-one million, eight hundred sixty-one thousand, six hundred sixty".