640665114 has 8 divisors (see below), whose sum is σ = 1281330240. Its totient is φ = 213555036.

The previous prime is 640665061. The next prime is 640665121. The reversal of 640665114 is 411566046.

It is a happy number.

640665114 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

640665114 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53388754 + ... + 53388765.

It is an arithmetic number, because the mean of its divisors is an integer number (160166280).

Almost surely, 2^640665114 is an apocalyptic number.

640665114 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640665114 is a wasteful number, since it uses less digits than its factorization.

640665114 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106777524.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 640665114 is about 25311.3633374419. The cubic root of 640665114 is about 862.0723027980.

The spelling of 640665114 in words is "six hundred forty million, six hundred sixty-five thousand, one hundred fourteen".