640408102788 has 48 divisors (see below), whose sum is σ = 1574392974336. Its totient is φ = 202205673120.

The previous prime is 640408102781. The next prime is 640408102847. The reversal of 640408102788 is 887201804046.

It is not an unprimeable number, because it can be changed into a prime (640408102781) 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, 11235258 + ... + 11292113.

It is an arithmetic number, because the mean of its divisors is an integer number (32799853632).

Almost surely, 2^640408102788 is an apocalyptic number.

It is an amenable number.

640408102788 is an abundant number, since it is smaller than the sum of its proper divisors (933984871548).

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

640408102788 is a wasteful number, since it uses less digits than its factorization.

640408102788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22527504 (or 22527502 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 48.

The spelling of 640408102788 in words is "six hundred forty billion, four hundred eight million, one hundred two thousand, seven hundred eighty-eight".