623744405 has 4 divisors (see below), whose sum is σ = 748493292. Its totient is φ = 498995520.

The previous prime is 623744389. The next prime is 623744431. The reversal of 623744405 is 504447326.

623744405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 397723249 + 226021156 = 19943^2 + 15034^2 .

It is not a de Polignac number, because 623744405 - 2⁴ = 623744389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62374436 + ... + 62374445.

It is an arithmetic number, because the mean of its divisors is an integer number (187123323).

Almost surely, 2^623744405 is an apocalyptic number.

It is an amenable number.

623744405 is a deficient number, since it is larger than the sum of its proper divisors (124748887).

623744405 is a wasteful number, since it uses less digits than its factorization.

623744405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124748886.

The product of its (nonzero) digits is 80640, while the sum is 35.

The square root of 623744405 is about 24974.8754751650. The cubic root of 623744405 is about 854.4150462395.

The spelling of 623744405 in words is "six hundred twenty-three million, seven hundred forty-four thousand, four hundred five".