644382669 has 8 divisors (see below), whose sum is σ = 981916480. Its totient is φ = 368218656.

The previous prime is 644382659. The next prime is 644382689. The reversal of 644382669 is 966283446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 644382669 - 2⁴ = 644382653 is a prime.

It is a super-2 number, since 2×644382669² = 830458048215127122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644382619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15342424 + ... + 15342465.

It is an arithmetic number, because the mean of its divisors is an integer number (122739560).

Almost surely, 2^644382669 is an apocalyptic number.

It is an amenable number.

644382669 is a deficient number, since it is larger than the sum of its proper divisors (337533811).

644382669 is a wasteful number, since it uses less digits than its factorization.

644382669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30684899.

The product of its digits is 1492992, while the sum is 48.

The square root of 644382669 is about 25384.6935967327. The cubic root of 644382669 is about 863.7365224018.

The spelling of 644382669 in words is "six hundred forty-four million, three hundred eighty-two thousand, six hundred sixty-nine".