128772044 has 12 divisors (see below), whose sum is σ = 237211800. Its totient is φ = 60997248.

The previous prime is 128772041. The next prime is 128772067. The reversal of 128772044 is 440277821.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 128771995 and 128772013.

It is not an unprimeable number, because it can be changed into a prime (128772041) 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 3 ways as a sum of consecutive naturals, for example, 847109 + ... + 847260.

It is an arithmetic number, because the mean of its divisors is an integer number (19767650).

Almost surely, 2^128772044 is an apocalyptic number.

It is an amenable number.

128772044 is a deficient number, since it is larger than the sum of its proper divisors (108439756).

128772044 is a wasteful number, since it uses less digits than its factorization.

128772044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694392 (or 1694390 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 35.

The square root of 128772044 is about 11347.7770510351. Note that the first 3 decimals coincide. The cubic root of 128772044 is about 504.9796338550.

The spelling of 128772044 in words is "one hundred twenty-eight million, seven hundred seventy-two thousand, forty-four".