640882579 has 2 divisors, whose sum is σ = 640882580. Its totient is φ = 640882578.

The previous prime is 640882573. The next prime is 640882607. The reversal of 640882579 is 975288046.

640882579 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640882579 - 2¹¹ = 640880531 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (640882573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320441289 + 320441290.

It is an arithmetic number, because the mean of its divisors is an integer number (320441290).

Almost surely, 2^640882579 is an apocalyptic number.

640882579 is a deficient number, since it is larger than the sum of its proper divisors (1).

640882579 is an equidigital number, since it uses as much as digits as its factorization.

640882579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 49.

The square root of 640882579 is about 25315.6587708082. The cubic root of 640882579 is about 862.1698313101.

The spelling of 640882579 in words is "six hundred forty million, eight hundred eighty-two thousand, five hundred seventy-nine".