28389288 has 32 divisors (see below), whose sum is σ = 72626400. Its totient is φ = 9242688.

The previous prime is 28389259. The next prime is 28389299. The reversal of 28389288 is 88298382.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12723 + ... + 14786.

It is an arithmetic number, because the mean of its divisors is an integer number (2269575).

Almost surely, 2^28389288 is an apocalyptic number.

It is an amenable number.

28389288 is an abundant number, since it is smaller than the sum of its proper divisors (44237112).

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

28389288 is a wasteful number, since it uses less digits than its factorization.

28389288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27561 (or 27557 counting only the distinct ones).

The product of its digits is 442368, while the sum is 48.

The square root of 28389288 is about 5328.1599075103. The cubic root of 28389288 is about 305.0596962790.

The spelling of 28389288 in words is "twenty-eight million, three hundred eighty-nine thousand, two hundred eighty-eight".