640884882 has 32 divisors (see below), whose sum is σ = 1419174144. Its totient is φ = 191307600.

The previous prime is 640884869. The next prime is 640884929. The reversal of 640884882 is 288488046.

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 15 ways as a sum of consecutive naturals, for example, 68044 + ... + 76887.

It is an arithmetic number, because the mean of its divisors is an integer number (44349192).

Almost surely, 2^640884882 is an apocalyptic number.

640884882 is an abundant number, since it is smaller than the sum of its proper divisors (778289262).

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

640884882 is a wasteful number, since it uses less digits than its factorization.

640884882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145014.

The product of its (nonzero) digits is 786432, while the sum is 48.

The square root of 640884882 is about 25315.7042564492. The cubic root of 640884882 is about 862.1708640394.

The spelling of 640884882 in words is "six hundred forty million, eight hundred eighty-four thousand, eight hundred eighty-two".