28493521 has 8 divisors (see below), whose sum is σ = 34278080. Its totient is φ = 23137488.

The previous prime is 28493503. The next prime is 28493533. The reversal of 28493521 is 12539482.

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

It is a cyclic number.

It is not a de Polignac number, because 28493521 - 2¹³ = 28485329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28493501) 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, 106986 + ... + 107251.

It is an arithmetic number, because the mean of its divisors is an integer number (4284760).

Almost surely, 2^28493521 is an apocalyptic number.

It is an amenable number.

28493521 is a deficient number, since it is larger than the sum of its proper divisors (5784559).

28493521 is a wasteful number, since it uses less digits than its factorization.

28493521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214263.

The product of its digits is 17280, while the sum is 34.

The square root of 28493521 is about 5337.9322775772. The cubic root of 28493521 is about 305.4325887033.

The spelling of 28493521 in words is "twenty-eight million, four hundred ninety-three thousand, five hundred twenty-one".