28981884 has 24 divisors (see below), whose sum is σ = 68901840. Its totient is φ = 9478144.

The previous prime is 28981879. The next prime is 28981891. The reversal of 28981884 is 48818982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22149 + ... + 23420.

It is an arithmetic number, because the mean of its divisors is an integer number (2870910).

Almost surely, 2^28981884 is an apocalyptic number.

It is an amenable number.

28981884 is an abundant number, since it is smaller than the sum of its proper divisors (39919956).

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

28981884 is a wasteful number, since it uses less digits than its factorization.

28981884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45629 (or 45627 counting only the distinct ones).

The product of its digits is 294912, while the sum is 48.

The square root of 28981884 is about 5383.4825159928. The cubic root of 28981884 is about 307.1676944245.

The spelling of 28981884 in words is "twenty-eight million, nine hundred eighty-one thousand, eight hundred eighty-four".