640260115 has 16 divisors (see below), whose sum is σ = 867062880. Its totient is φ = 449585920.

The previous prime is 640260113. The next prime is 640260133. The reversal of 640260115 is 511062046.

It is not a de Polignac number, because 640260115 - 2¹ = 640260113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640260115.

It is not an unprimeable number, because it can be changed into a prime (640260113) 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, 199114 + ... + 202303.

It is an arithmetic number, because the mean of its divisors is an integer number (54191430).

Almost surely, 2^640260115 is an apocalyptic number.

640260115 is a deficient number, since it is larger than the sum of its proper divisors (226802765).

640260115 is a wasteful number, since it uses less digits than its factorization.

640260115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401462.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 640260115 is about 25303.3617331769. The cubic root of 640260115 is about 861.8906103618.

The spelling of 640260115 in words is "six hundred forty million, two hundred sixty thousand, one hundred fifteen".