640250571 has 16 divisors (see below), whose sum is σ = 868792608. Its totient is φ = 419289600.

The previous prime is 640250551. The next prime is 640250641. The reversal of 640250571 is 175052046.

640250571 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640250571 - 2⁵ = 640250539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640250531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177001 + ... + 180581.

It is an arithmetic number, because the mean of its divisors is an integer number (54299538).

Almost surely, 2^640250571 is an apocalyptic number.

640250571 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

640250571 is a deficient number, since it is larger than the sum of its proper divisors (228542037).

640250571 is a wasteful number, since it uses less digits than its factorization.

640250571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4622.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 640250571 is about 25303.1731409323. The cubic root of 640250571 is about 861.8863277665.

The spelling of 640250571 in words is "six hundred forty million, two hundred fifty thousand, five hundred seventy-one".