129128282 has 8 divisors (see below), whose sum is σ = 194496852. Its totient is φ = 64296000.

The previous prime is 129128281. The next prime is 129128297. The reversal of 129128282 is 282821921.

It can be written as a sum of positive squares in 2 ways, for example, as 119880601 + 9247681 = 10949^2 + 3041^2 .

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

It is a super-2 number, since 2×129128282² = 33348226424543048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129128281) 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, 133469 + ... + 134432.

Almost surely, 2^129128282 is an apocalyptic number.

129128282 is a deficient number, since it is larger than the sum of its proper divisors (65368570).

129128282 is a wasteful number, since it uses less digits than its factorization.

129128282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268144.

The product of its digits is 9216, while the sum is 35.

The square root of 129128282 is about 11363.4625884895. The cubic root of 129128282 is about 505.4448676046. Note that the first 3 decimals are identical.

The spelling of 129128282 in words is "one hundred twenty-nine million, one hundred twenty-eight thousand, two hundred eighty-two".