644307703446 has 32 divisors (see below), whose sum is σ = 1451109436416. Its totient is φ = 188946540000.

The previous prime is 644307703439. The next prime is 644307703451.

644307703446 is nontrivially palindromic in base 10.

644307703446 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 = 644307703395 and 644307703404.

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, 157453405 + ... + 157457496.

It is an arithmetic number, because the mean of its divisors is an integer number (45347169888).

Almost surely, 2^644307703446 is an apocalyptic number.

644307703446 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

644307703446 is an abundant number, since it is smaller than the sum of its proper divisors (806801732970).

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

644307703446 is a wasteful number, since it uses less digits than its factorization.

644307703446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314910948.

The product of its (nonzero) digits is 4064256, while the sum is 48.

The spelling of 644307703446 in words is "six hundred forty-four billion, three hundred seven million, seven hundred three thousand, four hundred forty-six".