28218279 has 8 divisors (see below), whose sum is σ = 37660032. Its totient is φ = 18794360.

The previous prime is 28218269. The next prime is 28218293. The reversal of 28218279 is 97281282.

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 28218279 - 2¹³ = 28210087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28218259) 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, 177 + ... + 7514.

It is an arithmetic number, because the mean of its divisors is an integer number (4707504).

Almost surely, 2^28218279 is an apocalyptic number.

28218279 is a deficient number, since it is larger than the sum of its proper divisors (9441753).

28218279 is a wasteful number, since it uses less digits than its factorization.

28218279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8917.

The product of its digits is 32256, while the sum is 39.

The square root of 28218279 is about 5312.0880075541. The cubic root of 28218279 is about 304.4459312811.

The spelling of 28218279 in words is "twenty-eight million, two hundred eighteen thousand, two hundred seventy-nine".