28212715 has 8 divisors (see below), whose sum is σ = 34681248. Its totient is φ = 22019520.

The previous prime is 28212713. The next prime is 28212719. The reversal of 28212715 is 51721282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28212715 - 2¹ = 28212713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28212713) 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, 68607 + ... + 69016.

It is an arithmetic number, because the mean of its divisors is an integer number (4335156).

Almost surely, 2^28212715 is an apocalyptic number.

28212715 is a deficient number, since it is larger than the sum of its proper divisors (6468533).

28212715 is a wasteful number, since it uses less digits than its factorization.

28212715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137669.

The product of its digits is 2240, while the sum is 28.

The square root of 28212715 is about 5311.5642705327. The cubic root of 28212715 is about 304.4259200382.

Adding to 28212715 its reverse (51721282), we get a palindrome (79933997).

The spelling of 28212715 in words is "twenty-eight million, two hundred twelve thousand, seven hundred fifteen".