28011569 has 8 divisors (see below), whose sum is σ = 29621760. Its totient is φ = 26445600.

The previous prime is 28011551. The next prime is 28011611. The reversal of 28011569 is 96511082.

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

It is a cyclic number.

It is not a de Polignac number, because 28011569 - 2¹⁶ = 27946033 is a prime.

It is a super-2 number, since 2×28011569² = 1569295995683522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28011169) 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 7 ways as a sum of consecutive naturals, for example, 9749 + ... + 12290.

It is an arithmetic number, because the mean of its divisors is an integer number (3702720).

Almost surely, 2^28011569 is an apocalyptic number.

It is an amenable number.

28011569 is a deficient number, since it is larger than the sum of its proper divisors (1610191).

28011569 is a wasteful number, since it uses less digits than its factorization.

28011569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22111.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 28011569 is about 5292.5956769812. The cubic root of 28011569 is about 303.7007132120.

The spelling of 28011569 in words is "twenty-eight million, eleven thousand, five hundred sixty-nine".