640250267 has 2 divisors, whose sum is σ = 640250268. Its totient is φ = 640250266.

The previous prime is 640250249. The next prime is 640250291. The reversal of 640250267 is 762052046.

640250267 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640250267 - 2¹⁴ = 640233883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (640250227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320125133 + 320125134.

It is an arithmetic number, because the mean of its divisors is an integer number (320125134).

Almost surely, 2^640250267 is an apocalyptic number.

640250267 is a deficient number, since it is larger than the sum of its proper divisors (1).

640250267 is an equidigital number, since it uses as much as digits as its factorization.

640250267 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 640250267 is about 25303.1671337799. The cubic root of 640250267 is about 861.8861913545.

The spelling of 640250267 in words is "six hundred forty million, two hundred fifty thousand, two hundred sixty-seven".