644414049 has 20 divisors (see below), whose sum is σ = 964778496. Its totient is φ = 428656536.

The previous prime is 644414033. The next prime is 644414059. The reversal of 644414049 is 940414446.

644414049 is a `hidden beast` number, since 644 + 4 + 1 + 4 + 0 + 4 + 9 = 666.

644414049 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 644414049 - 2⁴ = 644414033 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 not an unprimeable number, because it can be changed into a prime (644414059) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 28912 + ... + 46094.

Almost surely, 2^644414049 is an apocalyptic number.

It is an amenable number.

644414049 is a deficient number, since it is larger than the sum of its proper divisors (320364447).

644414049 is a wasteful number, since it uses less digits than its factorization.

644414049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17658 (or 17649 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 644414049 is about 25385.3116782127. The cubic root of 644414049 is about 863.7505428555.

The spelling of 644414049 in words is "six hundred forty-four million, four hundred fourteen thousand, forty-nine".