28085884 has 12 divisors (see below), whose sum is σ = 50196384. Its totient is φ = 13744064.

The previous prime is 28085881. The next prime is 28085909. The reversal of 28085884 is 48858082.

It is a happy number.

It is a super-2 number, since 2×28085884² = 1577633760122912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28085884.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28085881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74509 + ... + 74884.

It is an arithmetic number, because the mean of its divisors is an integer number (4183032).

Almost surely, 2^28085884 is an apocalyptic number.

It is an amenable number.

28085884 is a deficient number, since it is larger than the sum of its proper divisors (22110500).

28085884 is a wasteful number, since it uses less digits than its factorization.

28085884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149444 (or 149442 counting only the distinct ones).

The product of its (nonzero) digits is 163840, while the sum is 43.

The square root of 28085884 is about 5299.6116838878. The cubic root of 28085884 is about 303.9690498269.

The spelling of 28085884 in words is "twenty-eight million, eighty-five thousand, eight hundred eighty-four".