128266817 has 8 divisors (see below), whose sum is σ = 146661312. Its totient is φ = 109890000.

The previous prime is 128266781. The next prime is 128266823. The reversal of 128266817 is 718662821.

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 128266817 - 2¹⁴ = 128250433 is a prime.

It is a super-2 number, since 2×128266817² = 32904752686622978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128266847) 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, 20567 + ... + 26067.

It is an arithmetic number, because the mean of its divisors is an integer number (18332664).

Almost surely, 2^128266817 is an apocalyptic number.

It is an amenable number.

128266817 is a deficient number, since it is larger than the sum of its proper divisors (18394495).

128266817 is an equidigital number, since it uses as much as digits as its factorization.

128266817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8839.

The product of its digits is 64512, while the sum is 41.

The square root of 128266817 is about 11325.4941172560. The cubic root of 128266817 is about 504.3183522945.

The spelling of 128266817 in words is "one hundred twenty-eight million, two hundred sixty-six thousand, eight hundred seventeen".