640585533 has 16 divisors (see below), whose sum is σ = 976919040. Its totient is φ = 365753136.

The previous prime is 640585529. The next prime is 640585537. The reversal of 640585533 is 335585046.

It is an interprime number because it is at equal distance from previous prime (640585529) and next prime (640585537).

It is not a de Polignac number, because 640585533 - 2² = 640585529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640585491 and 640585500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640585537) 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 15 ways as a sum of consecutive naturals, for example, 15778 + ... + 39116.

It is an arithmetic number, because the mean of its divisors is an integer number (61057440).

Almost surely, 2^640585533 is an apocalyptic number.

It is an amenable number.

640585533 is a deficient number, since it is larger than the sum of its proper divisors (336333507).

640585533 is a wasteful number, since it uses less digits than its factorization.

640585533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24656.

The product of its (nonzero) digits is 216000, while the sum is 39.

The square root of 640585533 is about 25309.7912476575. The cubic root of 640585533 is about 862.0366068652.

The spelling of 640585533 in words is "six hundred forty million, five hundred eighty-five thousand, five hundred thirty-three".