28508985 has 24 divisors (see below), whose sum is σ = 50117184. Its totient is φ = 14988960.

The previous prime is 28508959. The next prime is 28509011. The reversal of 28508985 is 58980582.

28508985 is nontrivially palindromic in base 4.

It is an interprime number because it is at equal distance from previous prime (28508959) and next prime (28509011).

It is not a de Polignac number, because 28508985 - 2¹¹ = 28506937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28508985.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1267 + ... + 7656.

It is an arithmetic number, because the mean of its divisors is an integer number (2088216).

Almost surely, 2^28508985 is an apocalyptic number.

It is an amenable number.

28508985 is a deficient number, since it is larger than the sum of its proper divisors (21608199).

28508985 is a wasteful number, since it uses less digits than its factorization.

28508985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9005 (or 9002 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The square root of 28508985 is about 5339.3805820526. The cubic root of 28508985 is about 305.4878334886.

The spelling of 28508985 in words is "twenty-eight million, five hundred eight thousand, nine hundred eighty-five".