640247270 has 16 divisors (see below), whose sum is σ = 1241094960. Its totient is φ = 236398944.

The previous prime is 640247269. The next prime is 640247273. The reversal of 640247270 is 72742046.

640247270 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640247273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2462360 + ... + 2462619.

It is an arithmetic number, because the mean of its divisors is an integer number (77568435).

Almost surely, 2^640247270 is an apocalyptic number.

640247270 is a deficient number, since it is larger than the sum of its proper divisors (600847690).

640247270 is a wasteful number, since it uses less digits than its factorization.

640247270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4924999.

The product of its (nonzero) digits is 18816, while the sum is 32.

The square root of 640247270 is about 25303.1079118752. The cubic root of 640247270 is about 861.8848465279.

The spelling of 640247270 in words is "six hundred forty million, two hundred forty-seven thousand, two hundred seventy".