3806779681 has 4 divisors (see below), whose sum is σ = 3834566532. Its totient is φ = 3778992832.

The previous prime is 3806779679. The next prime is 3806779709. The reversal of 3806779681 is 1869776083.

3806779681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1796064400 + 2010715281 = 42380^2 + 44841^2 .

It is a cyclic number.

It is not a de Polignac number, because 3806779681 - 2¹ = 3806779679 is a prime.

It is a super-2 number, since 2×3806779681² = 28983143079348923522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3806779601) 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, 13893220 + ... + 13893493.

It is an arithmetic number, because the mean of its divisors is an integer number (958641633).

Almost surely, 2^3806779681 is an apocalyptic number.

It is an amenable number.

3806779681 is a deficient number, since it is larger than the sum of its proper divisors (27786851).

3806779681 is a wasteful number, since it uses less digits than its factorization.

3806779681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27786850.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The square root of 3806779681 is about 61699.1059983854. The cubic root of 3806779681 is about 1561.4182370169.

The spelling of 3806779681 in words is "three billion, eight hundred six million, seven hundred seventy-nine thousand, six hundred eighty-one".