128758538 has 8 divisors (see below), whose sum is σ = 193382532. Its totient is φ = 64297696.

The previous prime is 128758529. The next prime is 128758543. The reversal of 128758538 is 835857821.

It can be written as a sum of positive squares in 2 ways, for example, as 113912929 + 14845609 = 10673^2 + 3853^2 .

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

It is a super-2 number, since 2×128758538² = 33157522215794888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128758492 and 128758501.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38795 + ... + 41982.

Almost surely, 2^128758538 is an apocalyptic number.

128758538 is a deficient number, since it is larger than the sum of its proper divisors (64623994).

128758538 is an equidigital number, since it uses as much as digits as its factorization.

128758538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81576.

The product of its digits is 537600, while the sum is 47.

The square root of 128758538 is about 11347.1819409050. The cubic root of 128758538 is about 504.9619786425.

The spelling of 128758538 in words is "one hundred twenty-eight million, seven hundred fifty-eight thousand, five hundred thirty-eight".