644828047283 has 24 divisors (see below), whose sum is σ = 773563944960. Its totient is φ = 535688921040.

The previous prime is 644828047277. The next prime is 644828047327. The reversal of 644828047283 is 382740828446.

It is not a de Polignac number, because 644828047283 - 2⁴ = 644828047267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644828047483) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1365491 + ... + 1776012.

It is an arithmetic number, because the mean of its divisors is an integer number (32231831040).

Almost surely, 2^644828047283 is an apocalyptic number.

644828047283 is a deficient number, since it is larger than the sum of its proper divisors (128735897677).

644828047283 is a wasteful number, since it uses less digits than its factorization.

644828047283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3141647 (or 3141640 counting only the distinct ones).

The product of its (nonzero) digits is 16515072, while the sum is 56.

The spelling of 644828047283 in words is "six hundred forty-four billion, eight hundred twenty-eight million, forty-seven thousand, two hundred eighty-three".