128618969 has 8 divisors (see below), whose sum is σ = 135274752. Its totient is φ = 122119920.

The previous prime is 128618933. The next prime is 128618983. The reversal of 128618969 is 969816821.

It is a happy number.

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 128618969 - 2⁸ = 128618713 is a prime.

It is a super-2 number, since 2×128618969² = 33085678373245922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128618909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37499 + ... + 40784.

It is an arithmetic number, because the mean of its divisors is an integer number (16909344).

Almost surely, 2^128618969 is an apocalyptic number.

It is an amenable number.

128618969 is a deficient number, since it is larger than the sum of its proper divisors (6655783).

128618969 is an equidigital number, since it uses as much as digits as its factorization.

128618969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78367.

The product of its digits is 373248, while the sum is 50.

The square root of 128618969 is about 11341.0303323816. The cubic root of 128618969 is about 504.7794599540.

The spelling of 128618969 in words is "one hundred twenty-eight million, six hundred eighteen thousand, nine hundred sixty-nine".