28820868 has 24 divisors (see below), whose sum is σ = 68890080. Its totient is φ = 9372480.

The previous prime is 28820849. The next prime is 28820873. The reversal of 28820868 is 86802882.

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, 28798 + ... + 29781.

It is an arithmetic number, because the mean of its divisors is an integer number (2870420).

Almost surely, 2^28820868 is an apocalyptic number.

It is an amenable number.

28820868 is an abundant number, since it is smaller than the sum of its proper divisors (40069212).

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

28820868 is a wasteful number, since it uses less digits than its factorization.

28820868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58627 (or 58625 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 42.

The square root of 28820868 is about 5368.5070550387. The cubic root of 28820868 is about 306.5977890891.

The spelling of 28820868 in words is "twenty-eight million, eight hundred twenty thousand, eight hundred sixty-eight".