2568645688 has 16 divisors (see below), whose sum is σ = 5504240880. Its totient is φ = 1100848128.

The previous prime is 2568645683. The next prime is 2568645697. The reversal of 2568645688 is 8865468652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2568645683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22934281 + ... + 22934392.

It is an arithmetic number, because the mean of its divisors is an integer number (344015055).

Almost surely, 2^2568645688 is an apocalyptic number.

2568645688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2568645688 is an abundant number, since it is smaller than the sum of its proper divisors (2935595192).

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

2568645688 is a wasteful number, since it uses less digits than its factorization.

2568645688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45868686 (or 45868682 counting only the distinct ones).

The product of its digits is 22118400, while the sum is 58.

The square root of 2568645688 is about 50681.8082550337. The cubic root of 2568645688 is about 1369.5190184685.

The spelling of 2568645688 in words is "two billion, five hundred sixty-eight million, six hundred forty-five thousand, six hundred eighty-eight".