136809144 has 48 divisors (see below), whose sum is σ = 379150200. Its totient is φ = 44541504.

The previous prime is 136809143. The next prime is 136809157. The reversal of 136809144 is 441908631.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 136809099 and 136809108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136809143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18999 + ... + 25190.

Almost surely, 2^136809144 is an apocalyptic number.

It is an amenable number.

136809144 is an abundant number, since it is smaller than the sum of its proper divisors (242341056).

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

136809144 is a wasteful number, since it uses less digits than its factorization.

136809144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44244 (or 44237 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 136809144 is about 11696.5441049910. The cubic root of 136809144 is about 515.2741732996.

The spelling of 136809144 in words is "one hundred thirty-six million, eight hundred nine thousand, one hundred forty-four".