28189508 has 24 divisors (see below), whose sum is σ = 51240000. Its totient is φ = 13553568.

The previous prime is 28189493. The next prime is 28189517. The reversal of 28189508 is 80598182.

It is a super-2 number, since 2×28189508² = 1589296722564128, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56243 + ... + 56741.

It is an arithmetic number, because the mean of its divisors is an integer number (2135000).

Almost surely, 2^28189508 is an apocalyptic number.

It is an amenable number.

28189508 is a deficient number, since it is larger than the sum of its proper divisors (23050492).

28189508 is a wasteful number, since it uses less digits than its factorization.

28189508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019 (or 1017 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 28189508 is about 5309.3792480854. The cubic root of 28189508 is about 304.3424263567.

The spelling of 28189508 in words is "twenty-eight million, one hundred eighty-nine thousand, five hundred eight".