640727502 has 16 divisors (see below), whose sum is σ = 1282673280. Its totient is φ = 213372792.

The previous prime is 640727473. The next prime is 640727509. The reversal of 640727502 is 205727046.

640727502 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 (640727509) 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, 43852 + ... + 56607.

It is an arithmetic number, because the mean of its divisors is an integer number (80167080).

Almost surely, 2^640727502 is an apocalyptic number.

640727502 is an abundant number, since it is smaller than the sum of its proper divisors (641945778).

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

640727502 is a wasteful number, since it uses less digits than its factorization.

640727502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101527.

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 640727502 is about 25312.5957183375. The cubic root of 640727502 is about 862.1002847707.

The spelling of 640727502 in words is "six hundred forty million, seven hundred twenty-seven thousand, five hundred two".