640086594 has 16 divisors (see below), whose sum is σ = 1463055168. Its totient is φ = 182881872.

The previous prime is 640086583. The next prime is 640086617. The reversal of 640086594 is 495680046.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 15240157 = 640086594 / (6 + 4 + 0 + 0 + 8 + 6 + 5 + 9 + 4).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7620037 + ... + 7620120.

It is an arithmetic number, because the mean of its divisors is an integer number (91440948).

Almost surely, 2^640086594 is an apocalyptic number.

640086594 is an abundant number, since it is smaller than the sum of its proper divisors (822968574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640086594 is a wasteful number, since it uses less digits than its factorization.

640086594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15240169.

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 640086594 is about 25299.9326876575. The cubic root of 640086594 is about 861.8127411594.

The spelling of 640086594 in words is "six hundred forty million, eighty-six thousand, five hundred ninety-four".