28484891 has 4 divisors (see below), whose sum is σ = 28561632. Its totient is φ = 28408152.

The previous prime is 28484881. The next prime is 28484899. The reversal of 28484891 is 19848482.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28484891 - 2¹⁴ = 28468507 is a prime.

It is a super-2 number, since 2×28484891² = 1622778030563762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28484899) 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, 37811 + ... + 38556.

It is an arithmetic number, because the mean of its divisors is an integer number (7140408).

Almost surely, 2^28484891 is an apocalyptic number.

28484891 is a deficient number, since it is larger than the sum of its proper divisors (76741).

28484891 is an equidigital number, since it uses as much as digits as its factorization.

28484891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76740.

The product of its digits is 147456, while the sum is 44.

The square root of 28484891 is about 5337.1238509145. The cubic root of 28484891 is about 305.4017495358.

The spelling of 28484891 in words is "twenty-eight million, four hundred eighty-four thousand, eight hundred ninety-one".