644050050 has 48 divisors (see below), whose sum is σ = 1825424832. Its totient is φ = 147211200.

The previous prime is 644050031. The next prime is 644050061. The reversal of 644050050 is 50050446.

It is a self number, because there is not a number n which added to its sum of digits gives 644050050.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 305641 + ... + 307740.

It is an arithmetic number, because the mean of its divisors is an integer number (38029684).

Almost surely, 2^644050050 is an apocalyptic number.

644050050 is an abundant number, since it is smaller than the sum of its proper divisors (1181374782).

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

644050050 is a wasteful number, since it uses less digits than its factorization.

644050050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613403 (or 613398 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 644050050 is about 25378.1411848859. The cubic root of 644050050 is about 863.5878816232.

The spelling of 644050050 in words is "six hundred forty-four million, fifty thousand, fifty".