128880538 has 4 divisors (see below), whose sum is σ = 193320810. Its totient is φ = 64440268.

The previous prime is 128880529. The next prime is 128880539. The reversal of 128880538 is 835088821.

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

It can be written as a sum of positive squares in only one way, i.e., 121947849 + 6932689 = 11043^2 + 2633^2 .

It is a super-2 number, since 2×128880538² = 33220386150338888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128880494 and 128880503.

It is not an unprimeable number, because it can be changed into a prime (128880539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32220133 + ... + 32220136.

Almost surely, 2^128880538 is an apocalyptic number.

128880538 is a deficient number, since it is larger than the sum of its proper divisors (64440272).

128880538 is an equidigital number, since it uses as much as digits as its factorization.

128880538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64440271.

The product of its (nonzero) digits is 122880, while the sum is 43.

The square root of 128880538 is about 11352.5564521829. The cubic root of 128880538 is about 505.1214138027.

The spelling of 128880538 in words is "one hundred twenty-eight million, eight hundred eighty thousand, five hundred thirty-eight".