28985538 has 8 divisors (see below), whose sum is σ = 57971088. Its totient is φ = 9661844.

The previous prime is 28985533. The next prime is 28985549. The reversal of 28985538 is 83558982.

It is a sphenic number, since it is the product of 3 distinct primes.

28985538 is an admirable number.

It is a super-2 number, since 2×28985538² = 1680322826298888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28985533) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2415456 + ... + 2415467.

It is an arithmetic number, because the mean of its divisors is an integer number (7246386).

Almost surely, 2^28985538 is an apocalyptic number.

28985538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28985538 is a wasteful number, since it uses less digits than its factorization.

28985538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4830928.

The product of its digits is 691200, while the sum is 48.

The square root of 28985538 is about 5383.8218766969. The cubic root of 28985538 is about 307.1806029894.

The spelling of 28985538 in words is "twenty-eight million, nine hundred eighty-five thousand, five hundred thirty-eight".