640588567 has 4 divisors (see below), whose sum is σ = 641074816. Its totient is φ = 640102320.

The previous prime is 640588523. The next prime is 640588579. The reversal of 640588567 is 765885046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 640588567 - 2¹⁹ = 640064279 is a prime.

It is a super-2 number, since 2×640588567² = 820707424342226978, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640588567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640589567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241143 + ... + 243784.

It is an arithmetic number, because the mean of its divisors is an integer number (160268704).

Almost surely, 2^640588567 is an apocalyptic number.

640588567 is a deficient number, since it is larger than the sum of its proper divisors (486249).

640588567 is a wasteful number, since it uses less digits than its factorization.

640588567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486248.

The product of its (nonzero) digits is 1612800, while the sum is 49.

The square root of 640588567 is about 25309.8511848648. The cubic root of 640588567 is about 862.0379678153.

The spelling of 640588567 in words is "six hundred forty million, five hundred eighty-eight thousand, five hundred sixty-seven".