640888599 has 8 divisors (see below), whose sum is σ = 920250352. Its totient is φ = 394392960.

The previous prime is 640888597. The next prime is 640888607. The reversal of 640888599 is 995888046.

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

It is not a de Polignac number, because 640888599 - 2¹ = 640888597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640888597) 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, 8216482 + ... + 8216559.

It is an arithmetic number, because the mean of its divisors is an integer number (115031294).

Almost surely, 2^640888599 is an apocalyptic number.

640888599 is a deficient number, since it is larger than the sum of its proper divisors (279361753).

640888599 is a wasteful number, since it uses less digits than its factorization.

640888599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16433057.

The product of its (nonzero) digits is 4976640, while the sum is 57.

The square root of 640888599 is about 25315.7776692718. Note that the first 3 decimals coincide. The cubic root of 640888599 is about 862.1725308406.

The spelling of 640888599 in words is "six hundred forty million, eight hundred eighty-eight thousand, five hundred ninety-nine".