28240579 has 4 divisors (see below), whose sum is σ = 28329984. Its totient is φ = 28151176.

The previous prime is 28240571. The next prime is 28240591. The reversal of 28240579 is 97504282.

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 28240579 - 2³ = 28240571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28240571) 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, 44227 + ... + 44860.

It is an arithmetic number, because the mean of its divisors is an integer number (7082496).

Almost surely, 2^28240579 is an apocalyptic number.

28240579 is a deficient number, since it is larger than the sum of its proper divisors (89405).

28240579 is an equidigital number, since it uses as much as digits as its factorization.

28240579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89404.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 28240579 is about 5314.1865793365. The cubic root of 28240579 is about 304.5261081131.

The spelling of 28240579 in words is "twenty-eight million, two hundred forty thousand, five hundred seventy-nine".