28303288 has 32 divisors (see below), whose sum is σ = 58489200. Its totient is φ = 12757248.

The previous prime is 28303273. The next prime is 28303291. The reversal of 28303288 is 88230382.

It is a super-2 number, since 2×28303288² = 1602152223221888, which contains 22 as substring.

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, 1308 + ... + 7636.

Almost surely, 2^28303288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28303288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29244600).

28303288 is an abundant number, since it is smaller than the sum of its proper divisors (30185912).

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

28303288 is a wasteful number, since it uses less digits than its factorization.

28303288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6391 (or 6387 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 28303288 is about 5320.0834579920. The cubic root of 28303288 is about 304.7513444102.

The spelling of 28303288 in words is "twenty-eight million, three hundred three thousand, two hundred eighty-eight".