28558169 has 4 divisors (see below), whose sum is σ = 28729344. Its totient is φ = 28386996.

The previous prime is 28558163. The next prime is 28558171. The reversal of 28558169 is 96185582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28558169 - 2²⁴ = 11780953 is a prime.

It is a super-2 number, since 2×28558169² = 1631138033265122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28558163) 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, 85337 + ... + 85670.

It is an arithmetic number, because the mean of its divisors is an integer number (7182336).

Almost surely, 2^28558169 is an apocalyptic number.

It is an amenable number.

28558169 is a deficient number, since it is larger than the sum of its proper divisors (171175).

28558169 is a wasteful number, since it uses less digits than its factorization.

28558169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171174.

The product of its digits is 172800, while the sum is 44.

The square root of 28558169 is about 5343.9843749772. The cubic root of 28558169 is about 305.6634094971.

The spelling of 28558169 in words is "twenty-eight million, five hundred fifty-eight thousand, one hundred sixty-nine".