2688893778 has 16 divisors (see below), whose sum is σ = 5378449536. Its totient is φ = 896187600.

The previous prime is 2688893773. The next prime is 2688893797. The reversal of 2688893778 is 8773988862.

It is a super-2 number, since 2×2688893778² = 14460299498734226568, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2688893773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36775 + ... + 82037.

It is an arithmetic number, because the mean of its divisors is an integer number (336153096).

Almost surely, 2^2688893778 is an apocalyptic number.

2688893778 is an abundant number, since it is smaller than the sum of its proper divisors (2689555758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2688893778 is a wasteful number, since it uses less digits than its factorization.

2688893778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55169.

The product of its digits is 65028096, while the sum is 66.

The square root of 2688893778 is about 51854.5444295869. The cubic root of 2688893778 is about 1390.5647478287.

The spelling of 2688893778 in words is "two billion, six hundred eighty-eight million, eight hundred ninety-three thousand, seven hundred seventy-eight".