3806778728115 has 128 divisors (see below), whose sum is σ = 7428478832640. Its totient is φ = 1834336627200.

The previous prime is 3806778728111. The next prime is 3806778728153. The reversal of 3806778728115 is 5118278776083.

3806778728115 is a `hidden beast` number, since 380 + 6 + 7 + 78 + 72 + 8 + 115 = 666.

3806778728115 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3806778728115 - 2² = 3806778728111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3806778728111) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 163292310 + ... + 163315620.

It is an arithmetic number, because the mean of its divisors is an integer number (58034990880).

Almost surely, 2^{3806778728115} is an apocalyptic number.

3806778728115 is a deficient number, since it is larger than the sum of its proper divisors (3621700104525).

3806778728115 is a wasteful number, since it uses less digits than its factorization.

3806778728115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24010 (or 24004 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 63.

The spelling of 3806778728115 in words is "three trillion, eight hundred six billion, seven hundred seventy-eight million, seven hundred twenty-eight thousand, one hundred fifteen".