28159500 has 48 divisors (see below), whose sum is σ = 82004832. Its totient is φ = 7508800.

The previous prime is 28159489. The next prime is 28159519. The reversal of 28159500 is 595182.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 15 ways as a sum of consecutive naturals, for example, 7887 + ... + 10886.

It is an arithmetic number, because the mean of its divisors is an integer number (1708434).

Almost surely, 2^28159500 is an apocalyptic number.

28159500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28159500 is an abundant number, since it is smaller than the sum of its proper divisors (53845332).

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

28159500 is a wasteful number, since it uses less digits than its factorization.

28159500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18795 (or 18783 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 28159500 is about 5306.5525532119. The cubic root of 28159500 is about 304.2343962099.

The spelling of 28159500 in words is "twenty-eight million, one hundred fifty-nine thousand, five hundred".