640214885 has 16 divisors (see below), whose sum is σ = 790141296. Its totient is φ = 497622528.

The previous prime is 640214873. The next prime is 640214893. The reversal of 640214885 is 588412046.

It is a happy number.

640214885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 7491169 + 632723716 = 2737^2 + 25154^2 .

It is a cyclic number.

It is not a de Polignac number, because 640214885 - 2⁸ = 640214629 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 155777 + ... + 159833.

It is an arithmetic number, because the mean of its divisors is an integer number (49383831).

Almost surely, 2^640214885 is an apocalyptic number.

It is an amenable number.

640214885 is a deficient number, since it is larger than the sum of its proper divisors (149926411).

640214885 is a wasteful number, since it uses less digits than its factorization.

640214885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4952.

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 640214885 is about 25302.4679626316. The cubic root of 640214885 is about 861.8703143241.

The spelling of 640214885 in words is "six hundred forty million, two hundred fourteen thousand, eight hundred eighty-five".