2688705 has 24 divisors (see below), whose sum is σ = 4703400. Its totient is φ = 1420800.

The previous prime is 2688701. The next prime is 2688731. The reversal of 2688705 is 5078862.

It can be written as a sum of positive squares in 4 ways, for example, as 501264 + 2187441 = 708^2 + 1479^2 .

It is not a de Polignac number, because 2688705 - 2² = 2688701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2688705.

It is not an unprimeable number, because it can be changed into a prime (2688701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6505 + ... + 6905.

It is an arithmetic number, because the mean of its divisors is an integer number (195975).

2^2688705 is an apocalyptic number.

It is an amenable number.

2688705 is a deficient number, since it is larger than the sum of its proper divisors (2014695).

2688705 is a wasteful number, since it uses less digits than its factorization.

2688705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 2688705 is about 1639.7271114426. The cubic root of 2688705 is about 139.0532204808.

The spelling of 2688705 in words is "two million, six hundred eighty-eight thousand, seven hundred five".