136255728 has 80 divisors (see below), whose sum is σ = 403545600. Its totient is φ = 38807808.

The previous prime is 136255711. The next prime is 136255733. The reversal of 136255728 is 827552631.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200926 + ... + 201602.

It is an arithmetic number, because the mean of its divisors is an integer number (5044320).

Almost surely, 2^136255728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 136255728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201772800).

136255728 is an abundant number, since it is smaller than the sum of its proper divisors (267289872).

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

136255728 is a wasteful number, since it uses less digits than its factorization.

136255728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294 (or 1288 counting only the distinct ones).

The product of its digits is 100800, while the sum is 39.

The square root of 136255728 is about 11672.8628879123. The cubic root of 136255728 is about 514.5784441059.

The spelling of 136255728 in words is "one hundred thirty-six million, two hundred fifty-five thousand, seven hundred twenty-eight".