128284273 has 4 divisors (see below), whose sum is σ = 138152308. Its totient is φ = 118416240.

The previous prime is 128284253. The next prime is 128284279. The reversal of 128284273 is 372482821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23590449 + 104693824 = 4857^2 + 10232^2 .

It is a cyclic number.

It is not a de Polignac number, because 128284273 - 2¹³ = 128276081 is a prime.

It is a super-3 number, since 3×128284273³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128284279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4933998 + ... + 4934023.

It is an arithmetic number, because the mean of its divisors is an integer number (34538077).

Almost surely, 2^128284273 is an apocalyptic number.

128284273 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

128284273 is a deficient number, since it is larger than the sum of its proper divisors (9868035).

128284273 is an equidigital number, since it uses as much as digits as its factorization.

128284273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9868034.

The product of its digits is 43008, while the sum is 37.

The square root of 128284273 is about 11326.2647417408. The cubic root of 128284273 is about 504.3412290396.

The spelling of 128284273 in words is "one hundred twenty-eight million, two hundred eighty-four thousand, two hundred seventy-three".