623441644 has 12 divisors (see below), whose sum is σ = 1246883344. Its totient is φ = 267189264.

The previous prime is 623441587. The next prime is 623441647. The reversal of 623441644 is 446144326.

623441644 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (623441647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11132859 + ... + 11132914.

Almost surely, 2^623441644 is an apocalyptic number.

It is an amenable number.

623441644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

623441644 is a wasteful number, since it uses less digits than its factorization.

623441644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22265784 (or 22265782 counting only the distinct ones).

The product of its digits is 55296, while the sum is 34.

The square root of 623441644 is about 24968.8134279545. The cubic root of 623441644 is about 854.2767815821.

The spelling of 623441644 in words is "six hundred twenty-three million, four hundred forty-one thousand, six hundred forty-four".