28686475 has 6 divisors (see below), whose sum is σ = 35571260. Its totient is φ = 22949160.

The previous prime is 28686473. The next prime is 28686491. The reversal of 28686475 is 57468682.

It is not a de Polignac number, because 28686475 - 2¹ = 28686473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28686473) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 573705 + ... + 573754.

Almost surely, 2^28686475 is an apocalyptic number.

28686475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28686475 is a deficient number, since it is larger than the sum of its proper divisors (6884785).

28686475 is a wasteful number, since it uses less digits than its factorization.

28686475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147469 (or 1147464 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The square root of 28686475 is about 5355.9756347467. The cubic root of 28686475 is about 306.1204866775.

It can be divided in two parts, 28686 and 475, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 28686475 in words is "twenty-eight million, six hundred eighty-six thousand, four hundred seventy-five".