128728038 has 16 divisors (see below), whose sum is σ = 261299520. Its totient is φ = 42268776.

The previous prime is 128728037. The next prime is 128728057. The reversal of 128728038 is 830827821.

It is a junction number, because it is equal to n+sod(n) for n = 128727987 and 128728005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128728037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159708 + ... + 160511.

It is an arithmetic number, because the mean of its divisors is an integer number (16331220).

Almost surely, 2^128728038 is an apocalyptic number.

128728038 is an abundant number, since it is smaller than the sum of its proper divisors (132571482).

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

128728038 is a wasteful number, since it uses less digits than its factorization.

128728038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320291.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 128728038 is about 11345.8379152886. The cubic root of 128728038 is about 504.9221041176.

It can be divided in two parts, 12872 and 8038, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 128728038 in words is "one hundred twenty-eight million, seven hundred twenty-eight thousand, thirty-eight".