623216321 has 48 divisors (see below), whose sum is σ = 825447168. Its totient is φ = 458006400.

The previous prime is 623216317. The next prime is 623216323. The reversal of 623216321 is 123612326.

It is not a de Polignac number, because 623216321 - 2² = 623216317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (623216323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2003756 + ... + 2004066.

It is an arithmetic number, because the mean of its divisors is an integer number (17196816).

Almost surely, 2^623216321 is an apocalyptic number.

623216321 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

623216321 is a deficient number, since it is larger than the sum of its proper divisors (202230847).

623216321 is a wasteful number, since it uses less digits than its factorization.

623216321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 411 counting only the distinct ones).

The product of its digits is 2592, while the sum is 26.

The square root of 623216321 is about 24964.3009315302. The cubic root of 623216321 is about 854.1738521936.

Adding to 623216321 its reverse (123612326), we get a palindrome (746828647).

The spelling of 623216321 in words is "six hundred twenty-three million, two hundred sixteen thousand, three hundred twenty-one".