321663444 has 24 divisors (see below), whose sum is σ = 758983680. Its totient is φ = 106016064.

The previous prime is 321663439. The next prime is 321663493. The reversal of 321663444 is 444366123.

It is a super-2 number, since 2×321663444² = 206934742411882272, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149524 + ... + 151659.

It is an arithmetic number, because the mean of its divisors is an integer number (31624320).

Almost surely, 2^321663444 is an apocalyptic number.

It is an amenable number.

321663444 is an abundant number, since it is smaller than the sum of its proper divisors (437320236).

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

321663444 is a wasteful number, since it uses less digits than its factorization.

321663444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301279 (or 301277 counting only the distinct ones).

The product of its digits is 41472, while the sum is 33.

The square root of 321663444 is about 17934.9782269174. The cubic root of 321663444 is about 685.1735181215.

The spelling of 321663444 in words is "three hundred twenty-one million, six hundred sixty-three thousand, four hundred forty-four".