2640258 has 12 divisors (see below), whose sum is σ = 5720598. Its totient is φ = 880080.

The previous prime is 2640251. The next prime is 2640271. The reversal of 2640258 is 8520462.

It can be written as a sum of positive squares in only one way, i.e., 2082249 + 558009 = 1443^2 + 747^2 .

It is not an unprimeable number, because it can be changed into a prime (2640251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73323 + ... + 73358.

2^2640258 is an apocalyptic number.

2640258 is an abundant number, since it is smaller than the sum of its proper divisors (3080340).

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

2640258 is a wasteful number, since it uses less digits than its factorization.

2640258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146689 (or 146686 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 2640258 is about 1624.8870729992. The cubic root of 2640258 is about 138.2129666990.

The spelling of 2640258 in words is "two million, six hundred forty thousand, two hundred fifty-eight".