2640250386 has 12 divisors (see below), whose sum is σ = 5720542542. Its totient is φ = 880083456.

The previous prime is 2640250351. The next prime is 2640250387. The reversal of 2640250386 is 6830520462.

2640250386 is a `hidden beast` number, since 2 + 640 + 2 + 5 + 0 + 3 + 8 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2638774161 + 1476225 = 51369^2 + 1215^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2640250386.

It is not an unprimeable number, because it can be changed into a prime (2640250387) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73340271 + ... + 73340306.

Almost surely, 2^2640250386 is an apocalyptic number.

2640250386 is an abundant number, since it is smaller than the sum of its proper divisors (3080292156).

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

2640250386 is a wasteful number, since it uses less digits than its factorization.

2640250386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146680585 (or 146680582 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 2640250386 is about 51383.3668223483. The cubic root of 2640250386 is about 1382.1283383894.

The spelling of 2640250386 in words is "two billion, six hundred forty million, two hundred fifty thousand, three hundred eighty-six".