644017041 has 8 divisors (see below), whose sum is σ = 954099360. Its totient is φ = 429344676.

The previous prime is 644017019. The next prime is 644017051. The reversal of 644017041 is 140710446.

644017041 is a `hidden beast` number, since 644 + 0 + 17 + 0 + 4 + 1 = 666.

644017041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 644017041 - 2¹⁰ = 644016017 is a prime.

It is a super-3 number, since 3×644017041³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 23852483 = 644017041 / (6 + 4 + 4 + 0 + 1 + 7 + 0 + 4 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 644016996 and 644017014.

It is not an unprimeable number, because it can be changed into a prime (644017051) 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, 11926215 + ... + 11926268.

It is an arithmetic number, because the mean of its divisors is an integer number (119262420).

Almost surely, 2^644017041 is an apocalyptic number.

It is an amenable number.

644017041 is a deficient number, since it is larger than the sum of its proper divisors (310082319).

644017041 is a wasteful number, since it uses less digits than its factorization.

644017041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23852492 (or 23852486 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 644017041 is about 25377.4908334138. The cubic root of 644017041 is about 863.5731277702.

Adding to 644017041 its reverse (140710446), we get a palindrome (784727487).

The spelling of 644017041 in words is "six hundred forty-four million, seventeen thousand, forty-one".