128809797 has 16 divisors (see below), whose sum is σ = 181056000. Its totient is φ = 81231984.

The previous prime is 128809787. The next prime is 128809801. The reversal of 128809797 is 797908821.

It is not a de Polignac number, because 128809797 - 2¹² = 128805701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128809777) 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 15 ways as a sum of consecutive naturals, for example, 51154 + ... + 53612.

It is an arithmetic number, because the mean of its divisors is an integer number (11316000).

Almost surely, 2^128809797 is an apocalyptic number.

It is an amenable number.

128809797 is a deficient number, since it is larger than the sum of its proper divisors (52246203).

128809797 is a wasteful number, since it uses less digits than its factorization.

128809797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3400.

The product of its (nonzero) digits is 508032, while the sum is 51.

The square root of 128809797 is about 11349.4403826797. The cubic root of 128809797 is about 505.0289785024.

The spelling of 128809797 in words is "one hundred twenty-eight million, eight hundred nine thousand, seven hundred ninety-seven".