28520241 has 4 divisors (see below), whose sum is σ = 38026992. Its totient is φ = 19013492.

The previous prime is 28520221. The next prime is 28520243. The reversal of 28520241 is 14202582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28520241 - 2⁵ = 28520209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28520243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4753371 + ... + 4753376.

It is an arithmetic number, because the mean of its divisors is an integer number (9506748).

Almost surely, 2^28520241 is an apocalyptic number.

It is an amenable number.

28520241 is a deficient number, since it is larger than the sum of its proper divisors (9506751).

28520241 is an equidigital number, since it uses as much as digits as its factorization.

28520241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9506750.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 28520241 is about 5340.4345328821. The cubic root of 28520241 is about 305.5280327288.

The spelling of 28520241 in words is "twenty-eight million, five hundred twenty thousand, two hundred forty-one".