2568681 has 12 divisors (see below), whose sum is σ = 3727620. Its totient is φ = 1704480.

The previous prime is 2568673. The next prime is 2568689. The reversal of 2568681 is 1868652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2568673) and next prime (2568689).

It can be written as a sum of positive squares in 2 ways, for example, as 826281 + 1742400 = 909^2 + 1320^2 .

It is not a de Polignac number, because 2568681 - 2³ = 2568673 is a prime.

It is a super-2 number, since 2×2568681² = 13196244159522, which contains 22 as substring.

2568681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2568689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1891 + ... + 2951.

It is an arithmetic number, because the mean of its divisors is an integer number (310635).

2^2568681 is an apocalyptic number.

It is an amenable number.

2568681 is a deficient number, since it is larger than the sum of its proper divisors (1158939).

2568681 is a wasteful number, since it uses less digits than its factorization.

2568681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336 (or 1333 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2568681 is about 1602.7105165937. The cubic root of 2568681 is about 136.9525294179.

It can be divided in two parts, 2568 and 681, that added together give a square (3249 = 57²).

The spelling of 2568681 in words is "two million, five hundred sixty-eight thousand, six hundred eighty-one".