28287475 has 12 divisors (see below), whose sum is σ = 35304784. Its totient is φ = 22482720.

The previous prime is 28287463. The next prime is 28287481. The reversal of 28287475 is 57478282.

It is not a de Polignac number, because 28287475 - 2²¹ = 26190323 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 322 + ... + 7528.

Almost surely, 2^28287475 is an apocalyptic number.

28287475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28287475 is a deficient number, since it is larger than the sum of its proper divisors (7017309).

28287475 is a wasteful number, since it uses less digits than its factorization.

28287475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7374 (or 7369 counting only the distinct ones).

The product of its digits is 250880, while the sum is 43.

The square root of 28287475 is about 5318.5970894588. The cubic root of 28287475 is about 304.6945791474.

The spelling of 28287475 in words is "twenty-eight million, two hundred eighty-seven thousand, four hundred seventy-five".