128240579 has 4 divisors (see below), whose sum is σ = 131368440. Its totient is φ = 125112720.

The previous prime is 128240573. The next prime is 128240599. The reversal of 128240579 is 975042821.

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

It is a cyclic number.

It is not a de Polignac number, because 128240579 - 2¹⁶ = 128175043 is a prime.

It is a super-2 number, since 2×128240579² = 32891292204510482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128240573) 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, 1563869 + ... + 1563950.

It is an arithmetic number, because the mean of its divisors is an integer number (32842110).

Almost surely, 2^128240579 is an apocalyptic number.

128240579 is a deficient number, since it is larger than the sum of its proper divisors (3127861).

128240579 is an equidigital number, since it uses as much as digits as its factorization.

128240579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3127860.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 128240579 is about 11324.3356979560. The cubic root of 128240579 is about 504.2839625029.

The spelling of 128240579 in words is "one hundred twenty-eight million, two hundred forty thousand, five hundred seventy-nine".