28668579 has 8 divisors (see below), whose sum is σ = 40473360. Its totient is φ = 17988096.

The previous prime is 28668571. The next prime is 28668589. The reversal of 28668579 is 97586682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28668579 - 2³ = 28668571 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 562129 = 28668579 / (2 + 8 + 6 + 6 + 8 + 5 + 7 + 9).

It is not an unprimeable number, because it can be changed into a prime (28668571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281014 + ... + 281115.

It is an arithmetic number, because the mean of its divisors is an integer number (5059170).

Almost surely, 2^28668579 is an apocalyptic number.

28668579 is a deficient number, since it is larger than the sum of its proper divisors (11804781).

28668579 is a wasteful number, since it uses less digits than its factorization.

28668579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562149.

The product of its digits is 1451520, while the sum is 51.

The square root of 28668579 is about 5354.3047167676. The cubic root of 28668579 is about 306.0568158845.

The spelling of 28668579 in words is "twenty-eight million, six hundred sixty-eight thousand, five hundred seventy-nine".