623451621 has 16 divisors (see below), whose sum is σ = 898793280. Its totient is φ = 382128000.

The previous prime is 623451607. The next prime is 623451629. The reversal of 623451621 is 126154326.

623451621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 623451621 - 2¹¹ = 623449573 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623451629) 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, 22056 + ... + 41633.

It is an arithmetic number, because the mean of its divisors is an integer number (56174580).

Almost surely, 2^623451621 is an apocalyptic number.

It is an amenable number.

623451621 is a deficient number, since it is larger than the sum of its proper divisors (275341659).

623451621 is a wasteful number, since it uses less digits than its factorization.

623451621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63956.

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

The square root of 623451621 is about 24969.0132163848. The cubic root of 623451621 is about 854.2813385838.

The spelling of 623451621 in words is "six hundred twenty-three million, four hundred fifty-one thousand, six hundred twenty-one".