640389312882 has 192 divisors, whose sum is σ = 1635320793600. Its totient is φ = 179058781440.

The previous prime is 640389312833. The next prime is 640389312883. The reversal of 640389312882 is 288213983046.

640389312882 is a `hidden beast` number, since 64 + 0 + 389 + 3 + 128 + 82 = 666.

It is a super-2 number, since 2×640389312882² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640389312883) 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 95 ways as a sum of consecutive naturals, for example, 22418533 + ... + 22447079.

It is an arithmetic number, because the mean of its divisors is an integer number (8517295800).

Almost surely, 2^640389312882 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640389312882, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (817660396800).

640389312882 is an abundant number, since it is smaller than the sum of its proper divisors (994931480718).

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

640389312882 is a wasteful number, since it uses less digits than its factorization.

640389312882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28741 (or 28738 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 640389312882 in words is "six hundred forty billion, three hundred eighty-nine million, three hundred twelve thousand, eight hundred eighty-two".