3688309705 has 4 divisors (see below), whose sum is σ = 4425971652. Its totient is φ = 2950647760.

The previous prime is 3688309687. The next prime is 3688309741. The reversal of 3688309705 is 5079038863.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5079038863 = 10253 ⋅495371.

It can be written as a sum of positive squares in 2 ways, for example, as 2247044409 + 1441265296 = 47403^2 + 37964^2 .

It is not a de Polignac number, because 3688309705 - 2¹⁷ = 3688178633 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368830966 + ... + 368830975.

It is an arithmetic number, because the mean of its divisors is an integer number (1106492913).

Almost surely, 2^3688309705 is an apocalyptic number.

It is an amenable number.

3688309705 is a deficient number, since it is larger than the sum of its proper divisors (737661947).

3688309705 is an equidigital number, since it uses as much as digits as its factorization.

3688309705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737661946.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 3688309705 is about 60731.4556469710. The cubic root of 3688309705 is about 1545.0497227777.

The spelling of 3688309705 in words is "three billion, six hundred eighty-eight million, three hundred nine thousand, seven hundred five".