640874285964 has 36 divisors (see below), whose sum is σ = 1767259395720. Its totient is φ = 194204328960.

The previous prime is 640874285951. The next prime is 640874285969. The reversal of 640874285964 is 469582478046.

640874285964 is a `hidden beast` number, since 6 + 40 + 87 + 428 + 5 + 96 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (640874285969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 809184309 + ... + 809185100.

It is an arithmetic number, because the mean of its divisors is an integer number (49090538770).

Almost surely, 2^640874285964 is an apocalyptic number.

It is an amenable number.

640874285964 is an abundant number, since it is smaller than the sum of its proper divisors (1126385109756).

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

640874285964 is a wasteful number, since it uses less digits than its factorization.

640874285964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618369430 (or 1618369425 counting only the distinct ones).

The product of its (nonzero) digits is 92897280, while the sum is 63.

The spelling of 640874285964 in words is "six hundred forty billion, eight hundred seventy-four million, two hundred eighty-five thousand, nine hundred sixty-four".