644842714350 has 48 divisors (see below), whose sum is σ = 1607246236800. Its totient is φ = 171093938400.

The previous prime is 644842714349. The next prime is 644842714357. The reversal of 644842714350 is 53417248446.

It is a self number, because there is not a number n which added to its sum of digits gives 644842714350.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644842714357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10771536 + ... + 10831235.

It is an arithmetic number, because the mean of its divisors is an integer number (33484296600).

Almost surely, 2^644842714350 is an apocalyptic number.

644842714350 is an abundant number, since it is smaller than the sum of its proper divisors (962403522450).

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

644842714350 is a wasteful number, since it uses less digits than its factorization.

644842714350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21602985 (or 21602980 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 48.

The spelling of 644842714350 in words is "six hundred forty-four billion, eight hundred forty-two million, seven hundred fourteen thousand, three hundred fifty".