28587225 has 24 divisors (see below), whose sum is σ = 47978080. Its totient is φ = 15016320.

The previous prime is 28587203. The next prime is 28587253. The reversal of 28587225 is 52278582.

It is a happy number.

It is not a de Polignac number, because 28587225 - 2⁹ = 28586713 is a prime.

It is an unprimeable number.

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, 2181 + ... + 7869.

Almost surely, 2^28587225 is an apocalyptic number.

28587225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28587225 is a deficient number, since it is larger than the sum of its proper divisors (19390855).

28587225 is a wasteful number, since it uses less digits than its factorization.

28587225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5769 (or 5764 counting only the distinct ones).

The product of its digits is 89600, while the sum is 39.

The square root of 28587225 is about 5346.7022546613. The cubic root of 28587225 is about 305.7670382891.

The spelling of 28587225 in words is "twenty-eight million, five hundred eighty-seven thousand, two hundred twenty-five".