644053400 has 24 divisors (see below), whose sum is σ = 1497424620. Its totient is φ = 257621280.

The previous prime is 644053391. The next prime is 644053409. The reversal of 644053400 is 4350446.

644053400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (644053391) and next prime (644053409).

It is a self number, because there is not a number n which added to its sum of digits gives 644053400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644053409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1609934 + ... + 1610333.

Almost surely, 2^644053400 is an apocalyptic number.

It is an amenable number.

644053400 is an abundant number, since it is smaller than the sum of its proper divisors (853371220).

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

644053400 is a wasteful number, since it uses less digits than its factorization.

644053400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220283 (or 3220274 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 644053400 is about 25378.2071864819. The cubic root of 644053400 is about 863.5893789263.

The spelling of 644053400 in words is "six hundred forty-four million, fifty-three thousand, four hundred".