28489475 has 24 divisors (see below), whose sum is σ = 40592640. Its totient is φ = 19429920.

The previous prime is 28489471. The next prime is 28489537. The reversal of 28489475 is 57498482.

It is a happy number.

It is not a de Polignac number, because 28489475 - 2² = 28489471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28489471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45716 + ... + 46334.

It is an arithmetic number, because the mean of its divisors is an integer number (1691360).

Almost surely, 2^28489475 is an apocalyptic number.

28489475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28489475 is a deficient number, since it is larger than the sum of its proper divisors (12103165).

28489475 is a wasteful number, since it uses less digits than its factorization.

28489475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899 (or 894 counting only the distinct ones).

The product of its digits is 645120, while the sum is 47.

The square root of 28489475 is about 5337.5532784226. The cubic root of 28489475 is about 305.4181311622.

The spelling of 28489475 in words is "twenty-eight million, four hundred eighty-nine thousand, four hundred seventy-five".