640904483 has 2 divisors, whose sum is σ = 640904484. Its totient is φ = 640904482.

The previous prime is 640904443. The next prime is 640904507. The reversal of 640904483 is 384409046.

640904483 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 a de Polignac number, because none of the positive numbers 2^k-640904483 is a prime.

It is not a weakly prime, because it can be changed into another prime (640904443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320452241 + 320452242.

It is an arithmetic number, because the mean of its divisors is an integer number (320452242).

Almost surely, 2^640904483 is an apocalyptic number.

640904483 is a deficient number, since it is larger than the sum of its proper divisors (1).

640904483 is an equidigital number, since it uses as much as digits as its factorization.

640904483 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 640904483 is about 25316.0913847300. The cubic root of 640904483 is about 862.1796535737.

The spelling of 640904483 in words is "six hundred forty million, nine hundred four thousand, four hundred eighty-three".