640426882 has 16 divisors (see below), whose sum is σ = 1016451360. Its totient is φ = 301784832.

The previous prime is 640426877. The next prime is 640426909. The reversal of 640426882 is 288624046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36328 + ... + 50995.

It is an arithmetic number, because the mean of its divisors is an integer number (63528210).

Almost surely, 2^640426882 is an apocalyptic number.

640426882 is a deficient number, since it is larger than the sum of its proper divisors (376024478).

640426882 is a wasteful number, since it uses less digits than its factorization.

640426882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87537.

The product of its (nonzero) digits is 147456, while the sum is 40.

The square root of 640426882 is about 25306.6568712661. The cubic root of 640426882 is about 861.9654353849.

It can be divided in two parts, 64042 and 6882, that multiplied together give a palindrome (440737044).

The spelling of 640426882 in words is "six hundred forty million, four hundred twenty-six thousand, eight hundred eighty-two".