28021124 has 24 divisors (see below), whose sum is σ = 51791040. Its totient is φ = 13228704.

The previous prime is 28021121. The next prime is 28021139. The reversal of 28021124 is 42112082.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28021096 and 28021105.

It is not an unprimeable number, because it can be changed into a prime (28021121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37862 + ... + 38594.

It is an arithmetic number, because the mean of its divisors is an integer number (2157960).

Almost surely, 2^28021124 is an apocalyptic number.

It is an amenable number.

28021124 is a deficient number, since it is larger than the sum of its proper divisors (23769916).

28021124 is a wasteful number, since it uses less digits than its factorization.

28021124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259 (or 1257 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 28021124 is about 5293.4982761875. The cubic root of 28021124 is about 303.7352409748.

The spelling of 28021124 in words is "twenty-eight million, twenty-one thousand, one hundred twenty-four".