28116840778 has 8 divisors (see below), whose sum is σ = 45419512068. Its totient is φ = 12977003424.

The previous prime is 28116840761. The next prime is 28116840781. The reversal of 28116840778 is 87704861182.

It can be written as a sum of positive squares in 2 ways, for example, as 20538615969 + 7578224809 = 143313^2 + 87053^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540708451 + ... + 540708502.

Almost surely, 2^28116840778 is an apocalyptic number.

28116840778 is a deficient number, since it is larger than the sum of its proper divisors (17302671290).

28116840778 is a wasteful number, since it uses less digits than its factorization.

28116840778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081416968.

The product of its (nonzero) digits is 1204224, while the sum is 52.

The spelling of 28116840778 in words is "twenty-eight billion, one hundred sixteen million, eight hundred forty thousand, seven hundred seventy-eight".