28797521 has 8 divisors (see below), whose sum is σ = 30418080. Its totient is φ = 27187488.

The previous prime is 28797499. The next prime is 28797523. The reversal of 28797521 is 12579782.

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 28797521 - 2²² = 24603217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28797523) 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, 3365 + ... + 8301.

It is an arithmetic number, because the mean of its divisors is an integer number (3802260).

Almost surely, 2^28797521 is an apocalyptic number.

It is an amenable number.

28797521 is a deficient number, since it is larger than the sum of its proper divisors (1620559).

28797521 is a wasteful number, since it uses less digits than its factorization.

28797521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5263.

The product of its digits is 70560, while the sum is 41.

The square root of 28797521 is about 5366.3321738409. The cubic root of 28797521 is about 306.5149778852.

The spelling of 28797521 in words is "twenty-eight million, seven hundred ninety-seven thousand, five hundred twenty-one".