3806778728117 has 4 divisors (see below), whose sum is σ = 3807682740576. Its totient is φ = 3805874715660.

The previous prime is 3806778728111. The next prime is 3806778728153. The reversal of 3806778728117 is 7118278776083.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3806778728117 - 2²² = 3806774533813 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 451999913 + ... + 452008334.

It is an arithmetic number, because the mean of its divisors is an integer number (951920685144).

Almost surely, 2^{3806778728117} is an apocalyptic number.

It is an amenable number.

3806778728117 is a deficient number, since it is larger than the sum of its proper divisors (904012459).

3806778728117 is an equidigital number, since it uses as much as digits as its factorization.

3806778728117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904012458.

The product of its (nonzero) digits is 44255232, while the sum is 65.

The spelling of 3806778728117 in words is "three trillion, eight hundred six billion, seven hundred seventy-eight million, seven hundred twenty-eight thousand, one hundred seventeen".