640882573 has 2 divisors, whose sum is σ = 640882574. Its totient is φ = 640882572.

The previous prime is 640882493. The next prime is 640882579. The reversal of 640882573 is 375288046.

640882573 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 can be written as a sum of positive squares in only one way, i.e., 451902564 + 188980009 = 21258^2 + 13747^2 .

It is a cyclic number.

It is not a de Polignac number, because 640882573 - 2⁹ = 640882061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640882579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320441286 + 320441287.

It is an arithmetic number, because the mean of its divisors is an integer number (320441287).

Almost surely, 2^640882573 is an apocalyptic number.

It is an amenable number.

640882573 is a deficient number, since it is larger than the sum of its proper divisors (1).

640882573 is an equidigital number, since it uses as much as digits as its factorization.

640882573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 43.

The square root of 640882573 is about 25315.6586523045. The cubic root of 640882573 is about 862.1698286195.

The spelling of 640882573 in words is "six hundred forty million, eight hundred eighty-two thousand, five hundred seventy-three".