331866172 has 48 divisors (see below), whose sum is σ = 679053312. Its totient is φ = 140374080.

The previous prime is 331866167. The next prime is 331866173. The reversal of 331866172 is 271668133.

It is a super-2 number, since 2×331866172² = 220270312235867168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331866173) 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, 33013 + ... + 41875.

It is an arithmetic number, because the mean of its divisors is an integer number (14146944).

Almost surely, 2^331866172 is an apocalyptic number.

331866172 is the 9738-th centered heptagonal number.

It is an amenable number.

331866172 is an abundant number, since it is smaller than the sum of its proper divisors (347187140).

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

331866172 is a wasteful number, since it uses less digits than its factorization.

331866172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8938 (or 8936 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 331866172 is about 18217.1944052865. The cubic root of 331866172 is about 692.3425053352.

The spelling of 331866172 in words is "three hundred thirty-one million, eight hundred sixty-six thousand, one hundred seventy-two".