644854050 has 72 divisors (see below), whose sum is σ = 1745892720. Its totient is φ = 170632800.

The previous prime is 644853983. The next prime is 644854073. The reversal of 644854050 is 50458446.

644854050 is a `hidden beast` number, since 64 + 4 + 8 + 540 + 50 = 666.

644854050 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 644853996 and 644854014.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 53481 + ... + 64419.

It is an arithmetic number, because the mean of its divisors is an integer number (24248510).

Almost surely, 2^644854050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 644854050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (872946360).

644854050 is an abundant number, since it is smaller than the sum of its proper divisors (1101038670).

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

644854050 is a wasteful number, since it uses less digits than its factorization.

644854050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11088 (or 11080 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The square root of 644854050 is about 25393.9766480164. The cubic root of 644854050 is about 863.9470855583.

The spelling of 644854050 in words is "six hundred forty-four million, eight hundred fifty-four thousand, fifty".