640512289092 has 48 divisors (see below), whose sum is σ = 1704168450432. Its totient is φ = 185487720960.

The previous prime is 640512289091. The next prime is 640512289099. The reversal of 640512289092 is 290982215046.

It is not an unprimeable number, because it can be changed into a prime (640512289091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120757584 + ... + 120762887.

It is an arithmetic number, because the mean of its divisors is an integer number (35503509384).

Almost surely, 2^640512289092 is an apocalyptic number.

It is an amenable number.

640512289092 is an abundant number, since it is smaller than the sum of its proper divisors (1063656161340).

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

640512289092 is a wasteful number, since it uses less digits than its factorization.

640512289092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241520508 (or 241520506 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 640512289092 in words is "six hundred forty billion, five hundred twelve million, two hundred eighty-nine thousand, ninety-two".