2688881 has 8 divisors (see below), whose sum is σ = 2908584. Its totient is φ = 2471040.

The previous prime is 2688877. The next prime is 2688883. The reversal of 2688881 is 1888862.

2688881 = 309² + 310² + ... + 334².

2688881 is nontrivially palindromic in base 9.

It can be written as a sum of positive squares in 4 ways, for example, as 80656 + 2608225 = 284^2 + 1615^2 .

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

It is not a de Polignac number, because 2688881 - 2² = 2688877 is a prime.

It is a super-2 number, since 2×2688881² = 14460162064322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2688883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4901 + ... + 5421.

It is an arithmetic number, because the mean of its divisors is an integer number (363573).

2^2688881 is an apocalyptic number.

2688881 is the 1160-th centered square number.

It is an amenable number.

2688881 is a deficient number, since it is larger than the sum of its proper divisors (219703).

2688881 is a wasteful number, since it uses less digits than its factorization.

2688881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931.

The product of its digits is 49152, while the sum is 41.

The square root of 2688881 is about 1639.7807780310. The cubic root of 2688881 is about 139.0562545106.

The spelling of 2688881 in words is "two million, six hundred eighty-eight thousand, eight hundred eighty-one".