640504012 has 12 divisors (see below), whose sum is σ = 1121062320. Its totient is φ = 320200496.

The previous prime is 640503991. The next prime is 640504097. The reversal of 640504012 is 210405046.

It is a super-2 number, since 2×640504012² = 820490778776192288, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 34314 + ... + 49582.

It is an arithmetic number, because the mean of its divisors is an integer number (93421860).

Almost surely, 2^640504012 is an apocalyptic number.

It is an amenable number.

640504012 is a deficient number, since it is larger than the sum of its proper divisors (480558308).

640504012 is a wasteful number, since it uses less digits than its factorization.

640504012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25760 (or 25758 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 640504012 is about 25308.1807327196. The cubic root of 640504012 is about 862.0000376828. Note that the first 4 decimals are identical.

Adding to 640504012 its reverse (210405046), we get a palindrome (850909058).

The spelling of 640504012 in words is "six hundred forty million, five hundred four thousand, twelve".