128079489 has 4 divisors (see below), whose sum is σ = 170772656. Its totient is φ = 85386324.

The previous prime is 128079487. The next prime is 128079491. The reversal of 128079489 is 984970821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (128079487) and next prime (128079491).

It is not a de Polignac number, because 128079489 - 2¹ = 128079487 is a prime.

It is a super-2 number, since 2×128079489² = 32808711005002242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128079487) 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, 21346579 + ... + 21346584.

It is an arithmetic number, because the mean of its divisors is an integer number (42693164).

Almost surely, 2^128079489 is an apocalyptic number.

It is an amenable number.

128079489 is a deficient number, since it is larger than the sum of its proper divisors (42693167).

128079489 is an equidigital number, since it uses as much as digits as its factorization.

128079489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42693166.

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 128079489 is about 11317.2209044447. The cubic root of 128079489 is about 504.0727211457.

The spelling of 128079489 in words is "one hundred twenty-eight million, seventy-nine thousand, four hundred eighty-nine".