644334713286 has 64 divisors (see below), whose sum is σ = 1489001584896. Its totient is φ = 183707596800.

The previous prime is 644334713189. The next prime is 644334713299. The reversal of 644334713286 is 682317433446.

644334713286 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (51).

644334713286 is a modest number, since divided by 713286 gives 644334 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3409761 + ... + 3593763.

It is an arithmetic number, because the mean of its divisors is an integer number (23265649764).

Almost surely, 2^644334713286 is an apocalyptic number.

644334713286 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

644334713286 is an abundant number, since it is smaller than the sum of its proper divisors (844666871610).

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

644334713286 is a wasteful number, since it uses less digits than its factorization.

644334713286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187157.

The product of its digits is 6967296, while the sum is 51.

The spelling of 644334713286 in words is "six hundred forty-four billion, three hundred thirty-four million, seven hundred thirteen thousand, two hundred eighty-six".