28218769 has 8 divisors (see below), whose sum is σ = 30461760. Its totient is φ = 26060496.

The previous prime is 28218767. The next prime is 28218787. The reversal of 28218769 is 96781282.

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 28218769 - 2¹ = 28218767 is a prime.

It is a super-2 number, since 2×28218769² = 1592597847750722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28218761) 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, 20487 + ... + 21820.

It is an arithmetic number, because the mean of its divisors is an integer number (3807720).

Almost surely, 2^28218769 is an apocalyptic number.

28218769 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28218769 is a deficient number, since it is larger than the sum of its proper divisors (2242991).

28218769 is a wasteful number, since it uses less digits than its factorization.

28218769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42359.

The product of its digits is 96768, while the sum is 43.

The square root of 28218769 is about 5312.1341285777. The cubic root of 28218769 is about 304.4476934680.

The spelling of 28218769 in words is "twenty-eight million, two hundred eighteen thousand, seven hundred sixty-nine".