28885520 has 20 divisors (see below), whose sum is σ = 67159020. Its totient is φ = 11554176.

The previous prime is 28885511. The next prime is 28885531. The reversal of 28885520 is 2558882.

It can be written as a sum of positive squares in 2 ways, for example, as 13424896 + 15460624 = 3664^2 + 3932^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180455 + ... + 180614.

It is an arithmetic number, because the mean of its divisors is an integer number (3357951).

Almost surely, 2^28885520 is an apocalyptic number.

28885520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28885520 is an abundant number, since it is smaller than the sum of its proper divisors (38273500).

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

28885520 is a wasteful number, since it uses less digits than its factorization.

28885520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361082 (or 361076 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 38.

The square root of 28885520 is about 5374.5250952991. The cubic root of 28885520 is about 306.8268749119.

The spelling of 28885520 in words is "twenty-eight million, eight hundred eighty-five thousand, five hundred twenty".