28820120 has 32 divisors (see below), whose sum is σ = 74109600. Its totient is φ = 9881088.

The previous prime is 28820119. The next prime is 28820149. The reversal of 28820120 is 2102882.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 51185 + ... + 51744.

It is an arithmetic number, because the mean of its divisors is an integer number (2315925).

Almost surely, 2^28820120 is an apocalyptic number.

28820120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28820120 is an abundant number, since it is smaller than the sum of its proper divisors (45289480).

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

28820120 is a wasteful number, since it uses less digits than its factorization.

28820120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102947 (or 102943 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 28820120 is about 5368.4373890360. The cubic root of 28820120 is about 306.5951366460.

The spelling of 28820120 in words is "twenty-eight million, eight hundred twenty thousand, one hundred twenty".