644113872470 has 32 divisors (see below), whose sum is σ = 1225490381280. Its totient is φ = 243072437760.

The previous prime is 644113872433. The next prime is 644113872499. The reversal of 644113872470 is 74278311446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6987557 + ... + 7079136.

It is an arithmetic number, because the mean of its divisors is an integer number (38296574415).

Almost surely, 2^644113872470 is an apocalyptic number.

644113872470 is a deficient number, since it is larger than the sum of its proper divisors (581376508810).

644113872470 is a wasteful number, since it uses less digits than its factorization.

644113872470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14066960.

The product of its (nonzero) digits is 903168, while the sum is 47.

The spelling of 644113872470 in words is "six hundred forty-four billion, one hundred thirteen million, eight hundred seventy-two thousand, four hundred seventy".