136220728 has 96 divisors (see below), whose sum is σ = 327139200. Its totient is φ = 51936768.

The previous prime is 136220713. The next prime is 136220741. The reversal of 136220728 is 827022631.

It is a self number, because there is not a number n which added to its sum of digits gives 136220728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 307275 + ... + 307717.

It is an arithmetic number, because the mean of its divisors is an integer number (3407700).

Almost surely, 2^136220728 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 136220728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163569600).

136220728 is an abundant number, since it is smaller than the sum of its proper divisors (190918472).

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

136220728 is a wasteful number, since it uses less digits than its factorization.

136220728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 136220728 is about 11671.3635878590. The cubic root of 136220728 is about 514.5343804223.

The spelling of 136220728 in words is "one hundred thirty-six million, two hundred twenty thousand, seven hundred twenty-eight".