28378216 has 16 divisors (see below), whose sum is σ = 53281440. Its totient is φ = 14169840.

The previous prime is 28378199. The next prime is 28378247. The reversal of 28378216 is 61287382.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5301 + ... + 9211.

It is an arithmetic number, because the mean of its divisors is an integer number (3330090).

Almost surely, 2^28378216 is an apocalyptic number.

It is an amenable number.

28378216 is a deficient number, since it is larger than the sum of its proper divisors (24903224).

28378216 is a wasteful number, since it uses less digits than its factorization.

28378216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4824 (or 4820 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 28378216 is about 5327.1207983300. The cubic root of 28378216 is about 305.0200327252.

The spelling of 28378216 in words is "twenty-eight million, three hundred seventy-eight thousand, two hundred sixteen".