644104083 has 8 divisors (see below), whose sum is σ = 981491968. Its totient is φ = 368059464.

The previous prime is 644104079. The next prime is 644104093. The reversal of 644104083 is 380401446.

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

It is not a de Polignac number, because 644104083 - 2² = 644104079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 644104083.

It is not an unprimeable number, because it can be changed into a prime (644104033) 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, 15335791 + ... + 15335832.

It is an arithmetic number, because the mean of its divisors is an integer number (122686496).

Almost surely, 2^644104083 is an apocalyptic number.

644104083 is a deficient number, since it is larger than the sum of its proper divisors (337387885).

644104083 is a wasteful number, since it uses less digits than its factorization.

644104083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30671633.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 644104083 is about 25379.2057204318. The cubic root of 644104083 is about 863.6120313712.

The spelling of 644104083 in words is "six hundred forty-four million, one hundred four thousand, eighty-three".