623320581 has 16 divisors (see below), whose sum is σ = 916856640. Its totient is φ = 374225280.

The previous prime is 623320567. The next prime is 623320583. The reversal of 623320581 is 185023326.

It is not a de Polignac number, because 623320581 - 2⁵ = 623320549 is a prime.

It is a super-2 number, since 2×623320581² = 777057093396355122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623320583) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 193311 + ... + 196508.

It is an arithmetic number, because the mean of its divisors is an integer number (57303540).

Almost surely, 2^623320581 is an apocalyptic number.

It is an amenable number.

623320581 is a deficient number, since it is larger than the sum of its proper divisors (293536059).

623320581 is a wasteful number, since it uses less digits than its factorization.

623320581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389876.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 623320581 is about 24966.3890260486. The cubic root of 623320581 is about 854.2214820974.

The spelling of 623320581 in words is "six hundred twenty-three million, three hundred twenty thousand, five hundred eighty-one".