128079577 has 4 divisors (see below), whose sum is σ = 128393140. Its totient is φ = 127766016.

The previous prime is 128079563. The next prime is 128079583. The reversal of 128079577 is 775970821.

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 49154121 + 78925456 = 7011^2 + 8884^2 .

It is a cyclic number.

It is not a de Polignac number, because 128079577 - 2¹¹ = 128077529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128079517) 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, 156168 + ... + 156985.

It is an arithmetic number, because the mean of its divisors is an integer number (32098285).

Almost surely, 2^128079577 is an apocalyptic number.

It is an amenable number.

128079577 is a deficient number, since it is larger than the sum of its proper divisors (313563).

128079577 is an equidigital number, since it uses as much as digits as its factorization.

128079577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313562.

The product of its (nonzero) digits is 246960, while the sum is 46.

The square root of 128079577 is about 11317.2247923243. The cubic root of 128079577 is about 504.0728365906.

The spelling of 128079577 in words is "one hundred twenty-eight million, seventy-nine thousand, five hundred seventy-seven".