623445644 has 12 divisors (see below), whose sum is σ = 1092992544. Its totient is φ = 311162064.

The previous prime is 623445611. The next prime is 623445673. The reversal of 623445644 is 446544326.

It is a junction number, because it is equal to n+sod(n) for n = 623445598 and 623445607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137684 + ... + 142139.

It is an arithmetic number, because the mean of its divisors is an integer number (91082712).

Almost surely, 2^623445644 is an apocalyptic number.

It is an amenable number.

623445644 is a deficient number, since it is larger than the sum of its proper divisors (469546900).

623445644 is a wasteful number, since it uses less digits than its factorization.

623445644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280384 (or 280382 counting only the distinct ones).

The product of its digits is 276480, while the sum is 38.

The square root of 623445644 is about 24968.8935277477. The cubic root of 623445644 is about 854.2786085907.

The spelling of 623445644 in words is "six hundred twenty-three million, four hundred forty-five thousand, six hundred forty-four".