644183045 has 8 divisors (see below), whose sum is σ = 843294240. Its totient is φ = 468496720.

The previous prime is 644183039. The next prime is 644183047. The reversal of 644183045 is 540381446.

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

It is a de Polignac number, because none of the positive numbers 2^k-644183045 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 644182996 and 644183014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644183047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5856155 + ... + 5856264.

It is an arithmetic number, because the mean of its divisors is an integer number (105411780).

Almost surely, 2^644183045 is an apocalyptic number.

It is an amenable number.

644183045 is a deficient number, since it is larger than the sum of its proper divisors (199111195).

644183045 is a wasteful number, since it uses less digits than its factorization.

644183045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11712435.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 644183045 is about 25380.7613163987. The cubic root of 644183045 is about 863.6473205678.

The spelling of 644183045 in words is "six hundred forty-four million, one hundred eighty-three thousand, forty-five".