136720728928 has 48 divisors (see below), whose sum is σ = 307647033120. Its totient is φ = 58589761536.

The previous prime is 136720728917. The next prime is 136720728929. The reversal of 136720728928 is 829827027631.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136720728929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4525200 + ... + 4555312.

It is an arithmetic number, because the mean of its divisors is an integer number (6409313190).

Almost surely, 2^136720728928 is an apocalyptic number.

It is an amenable number.

136720728928 is an abundant number, since it is smaller than the sum of its proper divisors (170926304192).

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

136720728928 is a wasteful number, since it uses less digits than its factorization.

136720728928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50399 (or 50391 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 136720728928 in words is "one hundred thirty-six billion, seven hundred twenty million, seven hundred twenty-eight thousand, nine hundred twenty-eight".