640117460 has 12 divisors (see below), whose sum is σ = 1344246708. Its totient is φ = 256046976.

The previous prime is 640117441. The next prime is 640117477. The reversal of 640117460 is 64711046.

640117460 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 2 ways, for example, as 264843076 + 375274384 = 16274^2 + 19372^2 .

It is a congruent 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, 16002917 + ... + 16002956.

It is an arithmetic number, because the mean of its divisors is an integer number (112020559).

Almost surely, 2^640117460 is an apocalyptic number.

It is an amenable number.

640117460 is an abundant number, since it is smaller than the sum of its proper divisors (704129248).

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

640117460 is a wasteful number, since it uses less digits than its factorization.

640117460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32005882 (or 32005880 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 640117460 is about 25300.5426819268. The cubic root of 640117460 is about 861.8265936000.

The spelling of 640117460 in words is "six hundred forty million, one hundred seventeen thousand, four hundred sixty".