28487215 has 4 divisors (see below), whose sum is σ = 34184664. Its totient is φ = 22789768.

The previous prime is 28487197. The next prime is 28487219. The reversal of 28487215 is 51278482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51278482 = 2 ⋅25639241.

It is a cyclic number.

It is not a de Polignac number, because 28487215 - 2¹⁷ = 28356143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28487219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2848717 + ... + 2848726.

It is an arithmetic number, because the mean of its divisors is an integer number (8546166).

Almost surely, 2^28487215 is an apocalyptic number.

28487215 is a deficient number, since it is larger than the sum of its proper divisors (5697449).

28487215 is an equidigital number, since it uses as much as digits as its factorization.

28487215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5697448.

The product of its digits is 35840, while the sum is 37.

The square root of 28487215 is about 5337.3415667353. The cubic root of 28487215 is about 305.4100549255.

The spelling of 28487215 in words is "twenty-eight million, four hundred eighty-seven thousand, two hundred fifteen".