2788668881 has 2 divisors, whose sum is σ = 2788668882. Its totient is φ = 2788668880.

The previous prime is 2788668871. The next prime is 2788668901. The reversal of 2788668881 is 1888668872.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2559449281 + 229219600 = 50591^2 + 15140^2 .

It is a cyclic number.

It is not a de Polignac number, because 2788668881 - 2³⁰ = 1714927057 is a prime.

It is a super-2 number, since 2×2788668881² = 15553348255715584322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2788668851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1394334440 + 1394334441.

It is an arithmetic number, because the mean of its divisors is an integer number (1394334441).

Almost surely, 2^2788668881 is an apocalyptic number.

It is an amenable number.

2788668881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2788668881 is an equidigital number, since it uses as much as digits as its factorization.

2788668881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16515072, while the sum is 62.

The square root of 2788668881 is about 52807.8486685455. The cubic root of 2788668881 is about 1407.5558954232. Note that the first 3 decimals are identical.

Subtracting from 2788668881 its reverse (1888668872), we obtain a palindrome (900000009).

The spelling of 2788668881 in words is "two billion, seven hundred eighty-eight million, six hundred sixty-eight thousand, eight hundred eighty-one".