623778564 has 24 divisors (see below), whose sum is σ = 1460232928. Its totient is φ = 207247680.

The previous prime is 623778557. The next prime is 623778577. The reversal of 623778564 is 465877326.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80977 + ... + 88344.

Almost surely, 2^623778564 is an apocalyptic number.

It is an amenable number.

623778564 is an abundant number, since it is smaller than the sum of its proper divisors (836454364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

623778564 is a wasteful number, since it uses less digits than its factorization.

623778564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169635 (or 169633 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 48.

The square root of 623778564 is about 24975.5593330760. The cubic root of 623778564 is about 854.4306431361.

The spelling of 623778564 in words is "six hundred twenty-three million, seven hundred seventy-eight thousand, five hundred sixty-four".