28303880 has 32 divisors (see below), whose sum is σ = 69474240. Its totient is φ = 10292160.

The previous prime is 28303879. The next prime is 28303897. The reversal of 28303880 is 8830382.

It is a super-3 number, since 3×28303880³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 31724 + ... + 32603.

It is an arithmetic number, because the mean of its divisors is an integer number (2171070).

Almost surely, 2^28303880 is an apocalyptic number.

28303880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28303880 is an abundant number, since it is smaller than the sum of its proper divisors (41170360).

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

28303880 is a wasteful number, since it uses less digits than its factorization.

28303880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64349 (or 64345 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 28303880 is about 5320.1390959260. The cubic root of 28303880 is about 304.7534691521.

The spelling of 28303880 in words is "twenty-eight million, three hundred three thousand, eight hundred eighty".