28088928 has 72 divisors (see below), whose sum is σ = 91295568. Its totient is φ = 8024832.

The previous prime is 28088927. The next prime is 28088959. The reversal of 28088928 is 82988082.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28088927) 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 11 ways as a sum of consecutive naturals, for example, 4951 + ... + 8982.

It is an arithmetic number, because the mean of its divisors is an integer number (1267994).

Almost surely, 2^28088928 is an apocalyptic number.

28088928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28088928 is an abundant number, since it is smaller than the sum of its proper divisors (63206640).

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

28088928 is a wasteful number, since it uses less digits than its factorization.

28088928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13956 (or 13945 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 45.

The square root of 28088928 is about 5299.8988669596. The cubic root of 28088928 is about 303.9800310060.

The spelling of 28088928 in words is "twenty-eight million, eighty-eight thousand, nine hundred twenty-eight".