2775681 has 16 divisors (see below), whose sum is σ = 4139520. Its totient is φ = 1838160.

The previous prime is 2775673. The next prime is 2775697. The reversal of 2775681 is 1865772.

It is not a de Polignac number, because 2775681 - 2³ = 2775673 is a prime.

It is a super-2 number, since 2×2775681² = 15408810027522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2775611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5791 + ... + 6251.

It is an arithmetic number, because the mean of its divisors is an integer number (258720).

2^2775681 is an apocalyptic number.

It is an amenable number.

2775681 is a deficient number, since it is larger than the sum of its proper divisors (1363839).

2775681 is a wasteful number, since it uses less digits than its factorization.

2775681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 687 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 2775681 is about 1666.0375145836. The cubic root of 2775681 is about 140.5367321630.

Subtracting from 2775681 its reverse (1865772), we obtain a palindrome (909909).

The spelling of 2775681 in words is "two million, seven hundred seventy-five thousand, six hundred eighty-one".