640143882 has 96 divisors (see below), whose sum is σ = 1655382144. Its totient is φ = 174960000.

The previous prime is 640143853. The next prime is 640143887. The reversal of 640143882 is 288341046.

640143882 is a `hidden beast` number, since 640 + 1 + 4 + 3 + 8 + 8 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (640143887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 283257 + ... + 285507.

It is an arithmetic number, because the mean of its divisors is an integer number (17243564).

Almost surely, 2^640143882 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640143882, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (827691072).

640143882 is an abundant number, since it is smaller than the sum of its proper divisors (1015238262).

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

640143882 is a wasteful number, since it uses less digits than its factorization.

640143882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364 (or 2361 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 640143882 is about 25301.0648392513. The cubic root of 640143882 is about 861.8384512513.

It can be divided in two parts, 64014 and 3882, that added together give a triangular number (67896 = T₃₆₈).

The spelling of 640143882 in words is "six hundred forty million, one hundred forty-three thousand, eight hundred eighty-two".