128968505 has 8 divisors (see below), whose sum is σ = 154838400. Its totient is φ = 103124016.

The previous prime is 128968403. The next prime is 128968519. The reversal of 128968505 is 505869821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128968505 - 2²⁰ = 127919929 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7616 + ... + 17774.

It is an arithmetic number, because the mean of its divisors is an integer number (19354800).

Almost surely, 2^128968505 is an apocalyptic number.

It is an amenable number.

128968505 is a deficient number, since it is larger than the sum of its proper divisors (25869895).

128968505 is a wasteful number, since it uses less digits than its factorization.

128968505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12703.

The product of its (nonzero) digits is 172800, while the sum is 44.

The square root of 128968505 is about 11356.4301168985. The cubic root of 128968505 is about 505.2363106690.

The spelling of 128968505 in words is "one hundred twenty-eight million, nine hundred sixty-eight thousand, five hundred five".