2688961 has 4 divisors (see below), whose sum is σ = 2933424. Its totient is φ = 2444500.

The previous prime is 2688949. The next prime is 2688977. The reversal of 2688961 is 1698862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2688961 - 2⁵ = 2688929 is a prime.

It is a super-2 number, since 2×2688961² = 14461022519042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2688761) 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, 122215 + ... + 122236.

It is an arithmetic number, because the mean of its divisors is an integer number (733356).

2^2688961 is an apocalyptic number.

It is an amenable number.

2688961 is a deficient number, since it is larger than the sum of its proper divisors (244463).

2688961 is a wasteful number, since it uses less digits than its factorization.

2688961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244462.

The product of its digits is 41472, while the sum is 40.

The square root of 2688961 is about 1639.8051713542. The cubic root of 2688961 is about 139.0576335712.

Subtracting from 2688961 its reverse (1698862), we obtain a palindrome (990099).

It can be divided in two parts, 268 and 8961, that added together give a palindrome (9229).

The spelling of 2688961 in words is "two million, six hundred eighty-eight thousand, nine hundred sixty-one".