640082865 has 16 divisors (see below), whose sum is σ = 1026931968. Its totient is φ = 340444416.

The previous prime is 640082851. The next prime is 640082879. The reversal of 640082865 is 568280046.

640082865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (640082851) and next prime (640082879).

It is not a de Polignac number, because 640082865 - 2⁸ = 640082609 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52632 + ... + 63641.

It is an arithmetic number, because the mean of its divisors is an integer number (64183248).

Almost surely, 2^640082865 is an apocalyptic number.

It is an amenable number.

640082865 is a deficient number, since it is larger than the sum of its proper divisors (386849103).

640082865 is a wasteful number, since it uses less digits than its factorization.

640082865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116648.

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 640082865 is about 25299.8589917019. The cubic root of 640082865 is about 861.8110675807.

The spelling of 640082865 in words is "six hundred forty million, eighty-two thousand, eight hundred sixty-five".