28848581 has 4 divisors (see below), whose sum is σ = 29337600. Its totient is φ = 28359564.

The previous prime is 28848577. The next prime is 28848587. The reversal of 28848581 is 18584882.

It is a happy number.

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 28848581 - 2² = 28848577 is a prime.

It is a super-2 number, since 2×28848581² = 1664481251427122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28848587) 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, 244421 + ... + 244538.

It is an arithmetic number, because the mean of its divisors is an integer number (7334400).

Almost surely, 2^28848581 is an apocalyptic number.

It is an amenable number.

28848581 is a deficient number, since it is larger than the sum of its proper divisors (489019).

28848581 is an equidigital number, since it uses as much as digits as its factorization.

28848581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489018.

The product of its digits is 163840, while the sum is 44.

The square root of 28848581 is about 5371.0875062691. The cubic root of 28848581 is about 306.6960283534.

The spelling of 28848581 in words is "twenty-eight million, eight hundred forty-eight thousand, five hundred eighty-one".