136636638 has 32 divisors (see below), whose sum is σ = 290528640. Its totient is φ = 42717600.

The previous prime is 136636613. The next prime is 136636649. The reversal of 136636638 is 836636631.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 136636638.

It is a congruent number.

It is an unprimeable number.

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, 5581 + ... + 17447.

It is an arithmetic number, because the mean of its divisors is an integer number (9079020).

Almost surely, 2^136636638 is an apocalyptic number.

136636638 is an abundant number, since it is smaller than the sum of its proper divisors (153892002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

136636638 is a wasteful number, since it uses less digits than its factorization.

136636638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11992.

The product of its digits is 279936, while the sum is 42.

The square root of 136636638 is about 11689.1675494879. The cubic root of 136636638 is about 515.0575082668.

It can be divided in two parts, 13663 and 6638, that added together give a triangular number (20301 = T₂₀₁).

The spelling of 136636638 in words is "one hundred thirty-six million, six hundred thirty-six thousand, six hundred thirty-eight".