640579333 has 2 divisors, whose sum is σ = 640579334. Its totient is φ = 640579332.

The previous prime is 640579327. The next prime is 640579337. The reversal of 640579333 is 333975046.

640579333 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., 640191204 + 388129 = 25302^2 + 623^2 .

It is a cyclic number.

It is not a de Polignac number, because 640579333 - 2⁹ = 640578821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640579337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320289666 + 320289667.

It is an arithmetic number, because the mean of its divisors is an integer number (320289667).

Almost surely, 2^640579333 is an apocalyptic number.

It is an amenable number.

640579333 is a deficient number, since it is larger than the sum of its proper divisors (1).

640579333 is an equidigital number, since it uses as much as digits as its factorization.

640579333 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 40.

The square root of 640579333 is about 25309.6687651182. The cubic root of 640579333 is about 862.0338257407.

The spelling of 640579333 in words is "six hundred forty million, five hundred seventy-nine thousand, three hundred thirty-three".