28166559 has 8 divisors (see below), whose sum is σ = 39188352. Its totient is φ = 17961240.

The previous prime is 28166527. The next prime is 28166561. The reversal of 28166559 is 95566182.

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

It is not a de Polignac number, because 28166559 - 2⁵ = 28166527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28166559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28166519) 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, 204037 + ... + 204174.

It is an arithmetic number, because the mean of its divisors is an integer number (4898544).

Almost surely, 2^28166559 is an apocalyptic number.

28166559 is a deficient number, since it is larger than the sum of its proper divisors (11021793).

28166559 is a wasteful number, since it uses less digits than its factorization.

28166559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408237.

The product of its digits is 129600, while the sum is 42.

The square root of 28166559 is about 5307.2176326207. The cubic root of 28166559 is about 304.2598158276.

The spelling of 28166559 in words is "twenty-eight million, one hundred sixty-six thousand, five hundred fifty-nine".