28216487 has 16 divisors (see below), whose sum is σ = 31413312. Its totient is φ = 25178880.

The previous prime is 28216477. The next prime is 28216493. The reversal of 28216487 is 78461282.

It is a cyclic number.

It is not a de Polignac number, because 28216487 - 2¹⁴ = 28200103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28216487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28216477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88853 + ... + 89169.

It is an arithmetic number, because the mean of its divisors is an integer number (1963332).

Almost surely, 2^28216487 is an apocalyptic number.

28216487 is a deficient number, since it is larger than the sum of its proper divisors (3196825).

28216487 is a wasteful number, since it uses less digits than its factorization.

28216487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538.

The product of its digits is 43008, while the sum is 38.

The square root of 28216487 is about 5311.9193329718. The cubic root of 28216487 is about 304.4394865383.

The spelling of 28216487 in words is "twenty-eight million, two hundred sixteen thousand, four hundred eighty-seven".