28130569 has 4 divisors (see below), whose sum is σ = 28182544. Its totient is φ = 28078596.

The previous prime is 28130549. The next prime is 28130579. The reversal of 28130569 is 96503182.

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 28130569 - 2¹⁷ = 27999497 is a prime.

It is a super-2 number, since 2×28130569² = 1582657824527522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28130519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25167 + ... + 26260.

It is an arithmetic number, because the mean of its divisors is an integer number (7045636).

Almost surely, 2^28130569 is an apocalyptic number.

It is an amenable number.

28130569 is a deficient number, since it is larger than the sum of its proper divisors (51975).

28130569 is an equidigital number, since it uses as much as digits as its factorization.

28130569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51974.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 28130569 is about 5303.8258832658. The cubic root of 28130569 is about 304.1301706216.

The spelling of 28130569 in words is "twenty-eight million, one hundred thirty thousand, five hundred sixty-nine".