28168215 has 16 divisors (see below), whose sum is σ = 47029248. Its totient is φ = 14369696.

The previous prime is 28168199. The next prime is 28168223. The reversal of 28168215 is 51286182.

It is a cyclic number.

It is not a de Polignac number, because 28168215 - 2⁴ = 28168199 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 40479 + ... + 41168.

It is an arithmetic number, because the mean of its divisors is an integer number (2939328).

Almost surely, 2^28168215 is an apocalyptic number.

28168215 is a deficient number, since it is larger than the sum of its proper divisors (18861033).

28168215 is a wasteful number, since it uses less digits than its factorization.

28168215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81678.

The product of its digits is 7680, while the sum is 33.

The square root of 28168215 is about 5307.3736442802. The cubic root of 28168215 is about 304.2657785058.

The spelling of 28168215 in words is "twenty-eight million, one hundred sixty-eight thousand, two hundred fifteen".