2568638 has 8 divisors (see below), whose sum is σ = 3907440. Its totient is φ = 1266160.

The previous prime is 2568623. The next prime is 2568641. The reversal of 2568638 is 8368652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a d-powerful number, because it can be written as 2¹⁷ + 5³ + 6⁴ + 8 + 6⁷ + 3¹⁰ + 8⁷ .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8903 + ... + 9186.

It is an arithmetic number, because the mean of its divisors is an integer number (488430).

2^2568638 is an apocalyptic number.

2568638 is a deficient number, since it is larger than the sum of its proper divisors (1338802).

2568638 is a wasteful number, since it uses less digits than its factorization.

2568638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18162.

The product of its digits is 69120, while the sum is 38.

The square root of 2568638 is about 1602.6971017631. The cubic root of 2568638 is about 136.9517652136.

The spelling of 2568638 in words is "two million, five hundred sixty-eight thousand, six hundred thirty-eight".