128879441 has 4 divisors (see below), whose sum is σ = 132022884. Its totient is φ = 125736000.

The previous prime is 128879407. The next prime is 128879447. The reversal of 128879441 is 144978821.

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 42315025 + 86564416 = 6505^2 + 9304^2 .

It is a cyclic number.

It is not a de Polignac number, because 128879441 - 2¹⁴ = 128863057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128879392 and 128879401.

It is not an unprimeable number, because it can be changed into a prime (128879447) 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, 1571660 + ... + 1571741.

It is an arithmetic number, because the mean of its divisors is an integer number (33005721).

Almost surely, 2^128879441 is an apocalyptic number.

It is an amenable number.

128879441 is a deficient number, since it is larger than the sum of its proper divisors (3143443).

128879441 is an equidigital number, since it uses as much as digits as its factorization.

128879441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3143442.

The product of its digits is 129024, while the sum is 44.

The square root of 128879441 is about 11352.5081369713. The cubic root of 128879441 is about 505.1199806415.

The spelling of 128879441 in words is "one hundred twenty-eight million, eight hundred seventy-nine thousand, four hundred forty-one".