128645969 has 8 divisors (see below), whose sum is σ = 134454912. Its totient is φ = 122855040.

The previous prime is 128645947. The next prime is 128645977. The reversal of 128645969 is 969546821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128645969 is a prime.

It is a super-2 number, since 2×128645969² = 33099570679897922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128645669) 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 7 ways as a sum of consecutive naturals, for example, 11324 + ... + 19634.

It is an arithmetic number, because the mean of its divisors is an integer number (16806864).

Almost surely, 2^128645969 is an apocalyptic number.

It is an amenable number.

128645969 is a deficient number, since it is larger than the sum of its proper divisors (5808943).

128645969 is an equidigital number, since it uses as much as digits as its factorization.

128645969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9007.

The product of its digits is 933120, while the sum is 50.

The square root of 128645969 is about 11342.2206379527. The cubic root of 128645969 is about 504.8147789844.

The spelling of 128645969 in words is "one hundred twenty-eight million, six hundred forty-five thousand, nine hundred sixty-nine".