623566321 has 8 divisors (see below), whose sum is σ = 712955840. Its totient is φ = 534253968.

The previous prime is 623566309. The next prime is 623566351. The reversal of 623566321 is 123665326.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 623566321 - 2⁵ = 623566289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623566351) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 786 + ... + 35323.

It is an arithmetic number, because the mean of its divisors is an integer number (89119480).

Almost surely, 2^623566321 is an apocalyptic number.

It is an amenable number.

623566321 is a deficient number, since it is larger than the sum of its proper divisors (89389519).

623566321 is a wasteful number, since it uses less digits than its factorization.

623566321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38583.

The product of its digits is 38880, while the sum is 34.

The square root of 623566321 is about 24971.3099576294. The cubic root of 623566321 is about 854.3337243974. Note that the first 3 decimals are identical.

The spelling of 623566321 in words is "six hundred twenty-three million, five hundred sixty-six thousand, three hundred twenty-one".