28213115 has 16 divisors (see below), whose sum is σ = 40969152. Its totient is φ = 18207744.

The previous prime is 28213109. The next prime is 28213121. The reversal of 28213115 is 51131282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28213109) and next prime (28213121).

It is a cyclic number.

It is not a de Polignac number, because 28213115 - 2⁴ = 28213099 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23114 + ... + 24303.

It is an arithmetic number, because the mean of its divisors is an integer number (2560572).

Almost surely, 2^28213115 is an apocalyptic number.

28213115 is a deficient number, since it is larger than the sum of its proper divisors (12756037).

28213115 is a wasteful number, since it uses less digits than its factorization.

28213115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47446.

The product of its digits is 480, while the sum is 23.

The square root of 28213115 is about 5311.6019240903. The cubic root of 28213115 is about 304.4273587487.

Adding to 28213115 its reverse (51131282), we get a palindrome (79344397).

The spelling of 28213115 in words is "twenty-eight million, two hundred thirteen thousand, one hundred fifteen".