39678636689 has 4 divisors (see below), whose sum is σ = 40071494580. Its totient is φ = 39285778800.

The previous prime is 39678636661. The next prime is 39678636727. The reversal of 39678636689 is 98663687693.

39678636689 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 23572996225 + 16105640464 = 153535^2 + 126908^2 .

It is a cyclic number.

It is not a de Polignac number, because 39678636689 - 2⁸ = 39678636433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39678636649) 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, 196428794 + ... + 196428995.

It is an arithmetic number, because the mean of its divisors is an integer number (10017873645).

Almost surely, 2^39678636689 is an apocalyptic number.

It is an amenable number.

39678636689 is a deficient number, since it is larger than the sum of its proper divisors (392857891).

39678636689 is a wasteful number, since it uses less digits than its factorization.

39678636689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392857890.

The product of its digits is 423263232, while the sum is 71.

The spelling of 39678636689 in words is "thirty-nine billion, six hundred seventy-eight million, six hundred thirty-six thousand, six hundred eighty-nine".