136684639 has 16 divisors (see below), whose sum is σ = 169566208. Its totient is φ = 107285472.

The previous prime is 136684621. The next prime is 136684661. The reversal of 136684639 is 936486631.

It is not a de Polignac number, because 136684639 - 2⁹ = 136684127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136684619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5644 + ... + 17470.

It is an arithmetic number, because the mean of its divisors is an integer number (10597888).

Almost surely, 2^136684639 is an apocalyptic number.

136684639 is a deficient number, since it is larger than the sum of its proper divisors (32881569).

136684639 is a wasteful number, since it uses less digits than its factorization.

136684639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11974.

The product of its digits is 559872, while the sum is 46.

The square root of 136684639 is about 11691.2205949593. The cubic root of 136684639 is about 515.1178151295.

The spelling of 136684639 in words is "one hundred thirty-six million, six hundred eighty-four thousand, six hundred thirty-nine".