128391170 has 16 divisors (see below), whose sum is σ = 243267840. Its totient is φ = 48653424.

The previous prime is 128391097. The next prime is 128391173. The reversal of 128391170 is 71193821.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128391173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337682 + ... + 338061.

It is an arithmetic number, because the mean of its divisors is an integer number (15204240).

Almost surely, 2^128391170 is an apocalyptic number.

128391170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128391170 is a deficient number, since it is larger than the sum of its proper divisors (114876670).

128391170 is a wasteful number, since it uses less digits than its factorization.

128391170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675769.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 128391170 is about 11330.9827464347. The cubic root of 128391170 is about 504.4812763351.

The spelling of 128391170 in words is "one hundred twenty-eight million, three hundred ninety-one thousand, one hundred seventy".