136549728 has 72 divisors (see below), whose sum is σ = 443793168. Its totient is φ = 39013632.

The previous prime is 136549727. The next prime is 136549741. The reversal of 136549728 is 827945631.

136549728 is a `hidden beast` number, since 1 + 36 + 549 + 72 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136549727) 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, 31851 + ... + 35882.

It is an arithmetic number, because the mean of its divisors is an integer number (6163794).

Almost surely, 2^136549728 is an apocalyptic number.

136549728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

136549728 is an abundant number, since it is smaller than the sum of its proper divisors (307243440).

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

136549728 is a wasteful number, since it uses less digits than its factorization.

136549728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67756 (or 67745 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 136549728 is about 11685.4494136939. The cubic root of 136549728 is about 514.9482814812.

The spelling of 136549728 in words is "one hundred thirty-six million, five hundred forty-nine thousand, seven hundred twenty-eight".