128772108 has 36 divisors (see below), whose sum is σ = 326322360. Its totient is φ = 42816576.

The previous prime is 128772079. The next prime is 128772121. The reversal of 128772108 is 801277821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 10816 + ... + 19352.

It is an arithmetic number, because the mean of its divisors is an integer number (9064510).

Almost surely, 2^128772108 is an apocalyptic number.

128772108 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128772108 is an abundant number, since it is smaller than the sum of its proper divisors (197550252).

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

128772108 is a wasteful number, since it uses less digits than its factorization.

128772108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8966 (or 8961 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 128772108 is about 11347.7798709704. The cubic root of 128772108 is about 504.9797175137.

The spelling of 128772108 in words is "one hundred twenty-eight million, seven hundred seventy-two thousand, one hundred eight".