28959820 has 24 divisors (see below), whose sum is σ = 61588800. Its totient is φ = 11436672.

The previous prime is 28959787. The next prime is 28959839. The reversal of 28959820 is 2895982.

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, 7585 + ... + 10744.

It is an arithmetic number, because the mean of its divisors is an integer number (2566200).

Almost surely, 2^28959820 is an apocalyptic number.

28959820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28959820 is an abundant number, since it is smaller than the sum of its proper divisors (32628980).

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

28959820 is a wasteful number, since it uses less digits than its factorization.

28959820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18417 (or 18415 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 28959820 is about 5381.4328946852. The cubic root of 28959820 is about 307.0897253892.

The spelling of 28959820 in words is "twenty-eight million, nine hundred fifty-nine thousand, eight hundred twenty".