623721404 has 12 divisors (see below), whose sum is σ = 1101714264. Its totient is φ = 308945904.

The previous prime is 623721403. The next prime is 623721409. The reversal of 623721404 is 404127326.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623721403) 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 3 ways as a sum of consecutive naturals, for example, 728219 + ... + 729074.

It is an arithmetic number, because the mean of its divisors is an integer number (91809522).

Almost surely, 2^623721404 is an apocalyptic number.

It is an amenable number.

623721404 is a deficient number, since it is larger than the sum of its proper divisors (477992860).

623721404 is a wasteful number, since it uses less digits than its factorization.

623721404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457404 (or 1457402 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 623721404 is about 24974.4149881434. The cubic root of 623721404 is about 854.4045437314.

The spelling of 623721404 in words is "six hundred twenty-three million, seven hundred twenty-one thousand, four hundred four".