640260882 has 32 divisors (see below), whose sum is σ = 1449653760. Its totient is φ = 209392560.

The previous prime is 640260853. The next prime is 640260899. The reversal of 640260882 is 288062046.

640260882 is a `hidden beast` number, since 6 + 40 + 2 + 608 + 8 + 2 = 666.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 108994 + ... + 114717.

It is an arithmetic number, because the mean of its divisors is an integer number (45301680).

Almost surely, 2^640260882 is an apocalyptic number.

640260882 is an abundant number, since it is smaller than the sum of its proper divisors (809392878).

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

640260882 is a wasteful number, since it uses less digits than its factorization.

640260882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223775 (or 223769 counting only the distinct ones).

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

The square root of 640260882 is about 25303.3768892612. The cubic root of 640260882 is about 861.8909545291.

The spelling of 640260882 in words is "six hundred forty million, two hundred sixty thousand, eight hundred eighty-two".