28488021 has 8 divisors (see below), whose sum is σ = 38012160. Its totient is φ = 18977952.

The previous prime is 28488017. The next prime is 28488023. The reversal of 28488021 is 12088482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28488021 - 2² = 28488017 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28488023) by changing a digit.

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, 2865 + ... + 8073.

It is an arithmetic number, because the mean of its divisors is an integer number (4751520).

Almost surely, 2^28488021 is an apocalyptic number.

It is an amenable number.

28488021 is a deficient number, since it is larger than the sum of its proper divisors (9524139).

28488021 is a wasteful number, since it uses less digits than its factorization.

28488021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7035.

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 28488021 is about 5337.4170719553. The cubic root of 28488021 is about 305.4129352607.

The spelling of 28488021 in words is "twenty-eight million, four hundred eighty-eight thousand, twenty-one".