136780728 has 32 divisors (see below), whose sum is σ = 390802560. Its totient is φ = 39080160.

The previous prime is 136780673. The next prime is 136780729. The reversal of 136780728 is 827087631.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 136780728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136780729) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 406918 + ... + 407253.

It is an arithmetic number, because the mean of its divisors is an integer number (12212580).

Almost surely, 2^136780728 is an apocalyptic number.

It is an amenable number.

136780728 is an abundant number, since it is smaller than the sum of its proper divisors (254021832).

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

136780728 is a wasteful number, since it uses less digits than its factorization.

136780728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814187 (or 814183 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 136780728 is about 11695.3293241362. The cubic root of 136780728 is about 515.2384957508.

The spelling of 136780728 in words is "one hundred thirty-six million, seven hundred eighty thousand, seven hundred twenty-eight".