136728906 has 16 divisors (see below), whose sum is σ = 279817824. Its totient is φ = 44516304.

The previous prime is 136728899. The next prime is 136728929. The reversal of 136728906 is 609827631.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264721 + ... + 265236.

It is an arithmetic number, because the mean of its divisors is an integer number (17488614).

Almost surely, 2^136728906 is an apocalyptic number.

136728906 is an abundant number, since it is smaller than the sum of its proper divisors (143088918).

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

136728906 is a wasteful number, since it uses less digits than its factorization.

136728906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530005.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 136728906 is about 11693.1136144314. The cubic root of 136728906 is about 515.1734182055.

It can be divided in two parts, 13672 and 8906, that added together give a triangular number (22578 = T₂₁₂).

The spelling of 136728906 in words is "one hundred thirty-six million, seven hundred twenty-eight thousand, nine hundred six".