644046107 has 2 divisors, whose sum is σ = 644046108. Its totient is φ = 644046106.

The previous prime is 644046103. The next prime is 644046119. The reversal of 644046107 is 701640446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 644046107 - 2² = 644046103 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (644046103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322023053 + 322023054.

It is an arithmetic number, because the mean of its divisors is an integer number (322023054).

Almost surely, 2^644046107 is an apocalyptic number.

644046107 is a deficient number, since it is larger than the sum of its proper divisors (1).

644046107 is an equidigital number, since it uses as much as digits as its factorization.

644046107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 644046107 is about 25378.0634998023. The cubic root of 644046107 is about 863.5861192685.

The spelling of 644046107 in words is "six hundred forty-four million, forty-six thousand, one hundred seven".