644432104362 has 8 divisors (see below), whose sum is σ = 1288864208736. Its totient is φ = 214810701452.

The previous prime is 644432104357. The next prime is 644432104391. The reversal of 644432104362 is 263401234446.

It is a sphenic number, since it is the product of 3 distinct primes.

644432104362 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 644432104362.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53702675358 + ... + 53702675369.

It is an arithmetic number, because the mean of its divisors is an integer number (161108026092).

Almost surely, 2^644432104362 is an apocalyptic number.

644432104362 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.

644432104362 is a wasteful number, since it uses less digits than its factorization.

644432104362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107405350732.

The product of its (nonzero) digits is 331776, while the sum is 39.

The spelling of 644432104362 in words is "six hundred forty-four billion, four hundred thirty-two million, one hundred four thousand, three hundred sixty-two".