28098521 has 8 divisors (see below), whose sum is σ = 30940704. Its totient is φ = 25304320.

The previous prime is 28098509. The next prime is 28098523. The reversal of 28098521 is 12589082.

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 28098521 - 2¹⁰ = 28097497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28098523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10760 + ... + 13113.

It is an arithmetic number, because the mean of its divisors is an integer number (3867588).

Almost surely, 2^28098521 is an apocalyptic number.

It is an amenable number.

28098521 is a deficient number, since it is larger than the sum of its proper divisors (2842183).

28098521 is a wasteful number, since it uses less digits than its factorization.

28098521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23991.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 28098521 is about 5300.8038069712. The cubic root of 28098521 is about 304.0146324040.

The spelling of 28098521 in words is "twenty-eight million, ninety-eight thousand, five hundred twenty-one".