28319215 has 16 divisors (see below), whose sum is σ = 35925120. Its totient is φ = 21371040.

The previous prime is 28319191. The next prime is 28319231. The reversal of 28319215 is 51291382.

It is not a de Polignac number, because 28319215 - 2⁵ = 28319183 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28680 + ... + 29650.

It is an arithmetic number, because the mean of its divisors is an integer number (2245320).

Almost surely, 2^28319215 is an apocalyptic number.

28319215 is a deficient number, since it is larger than the sum of its proper divisors (7605905).

28319215 is a wasteful number, since it uses less digits than its factorization.

28319215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302.

The product of its digits is 4320, while the sum is 31.

The square root of 28319215 is about 5321.5801224824. The cubic root of 28319215 is about 304.8084975403.

The spelling of 28319215 in words is "twenty-eight million, three hundred nineteen thousand, two hundred fifteen".