640015012 has 24 divisors (see below), whose sum is σ = 1378494656. Its totient is φ = 253192608.

The previous prime is 640015001. The next prime is 640015049. The reversal of 640015012 is 210510046.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 878778 + ... + 879505.

Almost surely, 2^640015012 is an apocalyptic number.

It is an amenable number.

640015012 is an abundant number, since it is smaller than the sum of its proper divisors (738479644).

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

640015012 is a wasteful number, since it uses less digits than its factorization.

640015012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758307 (or 1758305 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 640015012 is about 25298.5179803086. The cubic root of 640015012 is about 861.7806139546.

Adding to 640015012 its reverse (210510046), we get a palindrome (850525058).

It can be divided in two parts, 6400 and 15012, that added together give a palindrome (21412).

The spelling of 640015012 in words is "six hundred forty million, fifteen thousand, twelve".