28458281 has 4 divisors (see below), whose sum is σ = 28536192. Its totient is φ = 28380372.

The previous prime is 28458277. The next prime is 28458299. The reversal of 28458281 is 18285482.

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 28458281 - 2² = 28458277 is a prime.

It is a super-2 number, since 2×28458281² = 1619747514949922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28458271) 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 3 ways as a sum of consecutive naturals, for example, 38405 + ... + 39138.

It is an arithmetic number, because the mean of its divisors is an integer number (7134048).

Almost surely, 2^28458281 is an apocalyptic number.

It is an amenable number.

28458281 is a deficient number, since it is larger than the sum of its proper divisors (77911).

28458281 is an equidigital number, since it uses as much as digits as its factorization.

28458281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77910.

The product of its digits is 40960, while the sum is 38.

The square root of 28458281 is about 5334.6303527049. The cubic root of 28458281 is about 305.3066198934.

The spelling of 28458281 in words is "twenty-eight million, four hundred fifty-eight thousand, two hundred eighty-one".