128909764 has 12 divisors (see below), whose sum is σ = 227315088. Its totient is φ = 63962600.

The previous prime is 128909761. The next prime is 128909771. The reversal of 128909764 is 467909821.

It is not an unprimeable number, because it can be changed into a prime (128909761) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 122482 + ... + 123529.

It is an arithmetic number, because the mean of its divisors is an integer number (18942924).

Almost surely, 2^128909764 is an apocalyptic number.

It is an amenable number.

128909764 is a deficient number, since it is larger than the sum of its proper divisors (98405324).

128909764 is a wasteful number, since it uses less digits than its factorization.

128909764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246146 (or 246144 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 128909764 is about 11353.8435782778. The cubic root of 128909764 is about 505.1595927316.

The spelling of 128909764 in words is "one hundred twenty-eight million, nine hundred nine thousand, seven hundred sixty-four".