640057759 has 8 divisors (see below), whose sum is σ = 705025152. Its totient is φ = 576220440.

The previous prime is 640057751. The next prime is 640057787. The reversal of 640057759 is 957750046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640057759 - 2³ = 640057751 is a prime.

It is a super-2 number, since 2×640057759² = 819347869712204162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640057751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281329 + ... + 283594.

It is an arithmetic number, because the mean of its divisors is an integer number (88128144).

Almost surely, 2^640057759 is an apocalyptic number.

640057759 is a deficient number, since it is larger than the sum of its proper divisors (64967393).

640057759 is a wasteful number, since it uses less digits than its factorization.

640057759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565037.

The product of its (nonzero) digits is 264600, while the sum is 43.

The square root of 640057759 is about 25299.3628180632. The cubic root of 640057759 is about 861.7997998148.

The spelling of 640057759 in words is "six hundred forty million, fifty-seven thousand, seven hundred fifty-nine".