640585403 has 8 divisors (see below), whose sum is σ = 658241472. Its totient is φ = 622947456.

The previous prime is 640585369. The next prime is 640585411. The reversal of 640585403 is 304585046.

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 640585403 - 2²⁴ = 623808187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640585423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99251 + ... + 105507.

It is an arithmetic number, because the mean of its divisors is an integer number (82280184).

Almost surely, 2^640585403 is an apocalyptic number.

640585403 is a deficient number, since it is larger than the sum of its proper divisors (17656069).

640585403 is a wasteful number, since it uses less digits than its factorization.

640585403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9061.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 640585403 is about 25309.7886794813. The cubic root of 640585403 is about 862.0365485514.

The spelling of 640585403 in words is "six hundred forty million, five hundred eighty-five thousand, four hundred three".