644626883 has 2 divisors, whose sum is σ = 644626884. Its totient is φ = 644626882.

The previous prime is 644626867. The next prime is 644626897. The reversal of 644626883 is 388626446.

644626883 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 644626883 - 2⁴ = 644626867 is a prime.

It is not a weakly prime, because it can be changed into another prime (644626823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322313441 + 322313442.

It is an arithmetic number, because the mean of its divisors is an integer number (322313442).

Almost surely, 2^644626883 is an apocalyptic number.

644626883 is a deficient number, since it is larger than the sum of its proper divisors (1).

644626883 is an equidigital number, since it uses as much as digits as its factorization.

644626883 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1327104, while the sum is 47.

The square root of 644626883 is about 25389.5034019967. The cubic root of 644626883 is about 863.8456241924.

The spelling of 644626883 in words is "six hundred forty-four million, six hundred twenty-six thousand, eight hundred eighty-three".