644878483 has 2 divisors, whose sum is σ = 644878484. Its totient is φ = 644878482.

The previous prime is 644878477. The next prime is 644878511. The reversal of 644878483 is 384878446.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-644878483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 644878483.

It is not a weakly prime, because it can be changed into another prime (644878583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322439241 + 322439242.

It is an arithmetic number, because the mean of its divisors is an integer number (322439242).

Almost surely, 2^644878483 is an apocalyptic number.

644878483 is a deficient number, since it is larger than the sum of its proper divisors (1).

644878483 is an equidigital number, since it uses as much as digits as its factorization.

644878483 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4128768, while the sum is 52.

The square root of 644878483 is about 25394.4577221094. The cubic root of 644878483 is about 863.9579968399.

The spelling of 644878483 in words is "six hundred forty-four million, eight hundred seventy-eight thousand, four hundred eighty-three".