128166423 has 16 divisors (see below), whose sum is σ = 213056256. Its totient is φ = 66579840.

The previous prime is 128166421. The next prime is 128166433. The reversal of 128166423 is 324661821.

It is not a de Polignac number, because 128166423 - 2¹ = 128166421 is a prime.

It is a super-2 number, since 2×128166423² = 32853263969229858, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128166421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277186 + ... + 277647.

It is an arithmetic number, because the mean of its divisors is an integer number (13316016).

Almost surely, 2^128166423 is an apocalyptic number.

128166423 is a deficient number, since it is larger than the sum of its proper divisors (84889833).

128166423 is a wasteful number, since it uses less digits than its factorization.

128166423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554854.

The product of its digits is 13824, while the sum is 33.

The square root of 128166423 is about 11321.0610368463. The cubic root of 128166423 is about 504.1867418670.

The spelling of 128166423 in words is "one hundred twenty-eight million, one hundred sixty-six thousand, four hundred twenty-three".