28804521 has 8 divisors (see below), whose sum is σ = 38618944. Its totient is φ = 19096560.

The previous prime is 28804481. The next prime is 28804547. The reversal of 28804521 is 12540882.

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

It is not a de Polignac number, because 28804521 - 2⁷ = 28804393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28804571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25981 + ... + 27066.

It is an arithmetic number, because the mean of its divisors is an integer number (4827368).

Almost surely, 2^28804521 is an apocalyptic number.

It is an amenable number.

28804521 is a deficient number, since it is larger than the sum of its proper divisors (9814423).

28804521 is a wasteful number, since it uses less digits than its factorization.

28804521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53231.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 28804521 is about 5366.9843487754. The cubic root of 28804521 is about 306.5398114004.

The spelling of 28804521 in words is "twenty-eight million, eight hundred four thousand, five hundred twenty-one".