640415357 has 2 divisors, whose sum is σ = 640415358. Its totient is φ = 640415356.

The previous prime is 640415353. The next prime is 640415401. The reversal of 640415357 is 753514046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518290756 + 122124601 = 22766^2 + 11051^2 .

It is a cyclic number.

It is not a de Polignac number, because 640415357 - 2² = 640415353 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640415353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320207678 + 320207679.

It is an arithmetic number, because the mean of its divisors is an integer number (320207679).

Almost surely, 2^640415357 is an apocalyptic number.

It is an amenable number.

640415357 is a deficient number, since it is larger than the sum of its proper divisors (1).

640415357 is an equidigital number, since it uses as much as digits as its factorization.

640415357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 640415357 is about 25306.4291633569. The cubic root of 640415357 is about 861.9602647654.

The spelling of 640415357 in words is "six hundred forty million, four hundred fifteen thousand, three hundred fifty-seven".