644850117 has 12 divisors (see below), whose sum is σ = 947238240. Its totient is φ = 422613288.

The previous prime is 644850079. The next prime is 644850121. The reversal of 644850117 is 711058446.

It is a happy number.

644850117 is a `hidden beast` number, since 64 + 485 + 0 + 117 = 666.

It is not a de Polignac number, because 644850117 - 2⁶ = 644850053 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644850617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 606673 + ... + 607734.

It is an arithmetic number, because the mean of its divisors is an integer number (78936520).

Almost surely, 2^644850117 is an apocalyptic number.

It is an amenable number.

644850117 is a deficient number, since it is larger than the sum of its proper divisors (302388123).

644850117 is a wasteful number, since it uses less digits than its factorization.

644850117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214472 (or 1214469 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 644850117 is about 25393.8992082744. The cubic root of 644850117 is about 863.9453291346.

It can be divided in two parts, 6448 and 50117, that added together give a palindrome (56565).

The spelling of 644850117 in words is "six hundred forty-four million, eight hundred fifty thousand, one hundred seventeen".