28081579 has 4 divisors (see below), whose sum is σ = 28096776. Its totient is φ = 28066384.

The previous prime is 28081523. The next prime is 28081589. The reversal of 28081579 is 97518082.

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 28081579 - 2¹³ = 28073387 is a prime.

It is a super-3 number, since 3×28081579³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28081519) 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, 4369 + ... + 8674.

It is an arithmetic number, because the mean of its divisors is an integer number (7024194).

Almost surely, 2^28081579 is an apocalyptic number.

28081579 is a deficient number, since it is larger than the sum of its proper divisors (15197).

28081579 is a wasteful number, since it uses less digits than its factorization.

28081579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15196.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 28081579 is about 5299.2055064887. The cubic root of 28081579 is about 303.9535182569.

The spelling of 28081579 in words is "twenty-eight million, eighty-one thousand, five hundred seventy-nine".