28216569 has 8 divisors (see below), whose sum is σ = 38539872. Its totient is φ = 18352160.

The previous prime is 28216567. The next prime is 28216589. The reversal of 28216569 is 96561282.

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 28216569 - 2¹ = 28216567 is a prime.

It is a super-2 number, since 2×28216569² = 1592349532263522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28216567) 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, 114579 + ... + 114824.

It is an arithmetic number, because the mean of its divisors is an integer number (4817484).

Almost surely, 2^28216569 is an apocalyptic number.

It is an amenable number.

28216569 is a deficient number, since it is larger than the sum of its proper divisors (10323303).

28216569 is a wasteful number, since it uses less digits than its factorization.

28216569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229447.

The product of its digits is 51840, while the sum is 39.

The square root of 28216569 is about 5311.9270514569. The cubic root of 28216569 is about 304.4397814487.

The spelling of 28216569 in words is "twenty-eight million, two hundred sixteen thousand, five hundred sixty-nine".