1328728579 has 4 divisors (see below), whose sum is σ = 1328911920. Its totient is φ = 1328545240.

The previous prime is 1328728573. The next prime is 1328728589. The reversal of 1328728579 is 9758278231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9758278231 = 13 ⋅750636787.

It is a cyclic number.

It is not a de Polignac number, because 1328728579 - 2⁵ = 1328728547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328728573) 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, 80332 + ... + 95449.

It is an arithmetic number, because the mean of its divisors is an integer number (332227980).

Almost surely, 2^1328728579 is an apocalyptic number.

1328728579 is a deficient number, since it is larger than the sum of its proper divisors (183341).

1328728579 is an equidigital number, since it uses as much as digits as its factorization.

1328728579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183340.

The product of its digits is 1693440, while the sum is 52.

The square root of 1328728579 is about 36451.7294377098. The cubic root of 1328728579 is about 1099.3739078992.

The spelling of 1328728579 in words is "one billion, three hundred twenty-eight million, seven hundred twenty-eight thousand, five hundred seventy-nine".