28688575 has 12 divisors (see below), whose sum is σ = 37446760. Its totient is φ = 21742560.

The previous prime is 28688557. The next prime is 28688587. The reversal of 28688575 is 57588682.

It is a happy number.

It is not a de Polignac number, because 28688575 - 2⁷ = 28688447 is a prime.

It is a congruent 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, 29724 + ... + 30673.

Almost surely, 2^28688575 is an apocalyptic number.

28688575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28688575 is a deficient number, since it is larger than the sum of its proper divisors (8758185).

28688575 is a wasteful number, since it uses less digits than its factorization.

28688575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60426 (or 60421 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 49.

The square root of 28688575 is about 5356.1716738730. The cubic root of 28688575 is about 306.1279563688.

The spelling of 28688575 in words is "twenty-eight million, six hundred eighty-eight thousand, five hundred seventy-five".