2688281 has 4 divisors (see below), whose sum is σ = 2692452. Its totient is φ = 2684112.

The previous prime is 2688239. The next prime is 2688299. The reversal of 2688281 is 1828862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2175625 + 512656 = 1475^2 + 716^2 .

It is a cyclic number.

It is not a de Polignac number, because 2688281 - 2¹⁰ = 2687257 is a prime.

It is a super-2 number, since 2×2688281² = 14453709469922, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹⁹ + 6⁴ + 8 + 8⁵ + 2²¹ + 8⁵ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2688221) 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, 890 + ... + 2483.

It is an arithmetic number, because the mean of its divisors is an integer number (673113).

2^2688281 is an apocalyptic number.

It is an amenable number.

2688281 is a deficient number, since it is larger than the sum of its proper divisors (4171).

2688281 is an equidigital number, since it uses as much as digits as its factorization.

2688281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4170.

The product of its digits is 12288, while the sum is 35.

The square root of 2688281 is about 1639.5978165392. The cubic root of 2688281 is about 139.0459106836.

The spelling of 2688281 in words is "two million, six hundred eighty-eight thousand, two hundred eighty-one".