640593347 has 2 divisors, whose sum is σ = 640593348. Its totient is φ = 640593346.

The previous prime is 640593329. The next prime is 640593361. The reversal of 640593347 is 743395046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640593347 - 2¹⁸ = 640331203 is a prime.

It is not a weakly prime, because it can be changed into another prime (640593367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320296673 + 320296674.

It is an arithmetic number, because the mean of its divisors is an integer number (320296674).

Almost surely, 2^640593347 is an apocalyptic number.

640593347 is a deficient number, since it is larger than the sum of its proper divisors (1).

640593347 is an equidigital number, since it uses as much as digits as its factorization.

640593347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 41.

The square root of 640593347 is about 25309.9456143232. The cubic root of 640593347 is about 862.0401119535.

The spelling of 640593347 in words is "six hundred forty million, five hundred ninety-three thousand, three hundred forty-seven".