28288500 has 48 divisors (see below), whose sum is σ = 82380480. Its totient is φ = 7543200.

The previous prime is 28288499. The next prime is 28288529. The reversal of 28288500 is 588282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7930 + ... + 10929.

It is an arithmetic number, because the mean of its divisors is an integer number (1716260).

Almost surely, 2^28288500 is an apocalyptic number.

28288500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28288500 is an abundant number, since it is smaller than the sum of its proper divisors (54091980).

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

28288500 is a wasteful number, since it uses less digits than its factorization.

28288500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18881 (or 18869 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 33.

The square root of 28288500 is about 5318.6934485830. The cubic root of 28288500 is about 304.6982593176.

The spelling of 28288500 in words is "twenty-eight million, two hundred eighty-eight thousand, five hundred".