128275538 has 8 divisors (see below), whose sum is σ = 193028988. Its totient is φ = 63932544.

The previous prime is 128275519. The next prime is 128275547. The reversal of 128275538 is 835572821.

It can be written as a sum of positive squares in 2 ways, for example, as 120055849 + 8219689 = 10957^2 + 2867^2 .

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

It is a super-2 number, since 2×128275538² = 32909227298378888, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 128275495 and 128275504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101831 + ... + 103082.

Almost surely, 2^128275538 is an apocalyptic number.

128275538 is a deficient number, since it is larger than the sum of its proper divisors (64753450).

128275538 is a wasteful number, since it uses less digits than its factorization.

128275538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205228.

The product of its digits is 134400, while the sum is 41.

The square root of 128275538 is about 11325.8791270259. The cubic root of 128275538 is about 504.3297817527.

The spelling of 128275538 in words is "one hundred twenty-eight million, two hundred seventy-five thousand, five hundred thirty-eight".