28382881 has 4 divisors (see below), whose sum is σ = 29042992. Its totient is φ = 27722772.

The previous prime is 28382869. The next prime is 28382891. The reversal of 28382881 is 18828382.

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 a de Polignac number, because none of the positive numbers 2^k-28382881 is a prime.

It is a super-2 number, since 2×28382881² = 1611175867720322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28382821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329991 + ... + 330076.

It is an arithmetic number, because the mean of its divisors is an integer number (7260748).

Almost surely, 2^28382881 is an apocalyptic number.

It is an amenable number.

28382881 is a deficient number, since it is larger than the sum of its proper divisors (660111).

28382881 is an equidigital number, since it uses as much as digits as its factorization.

28382881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660110.

The product of its digits is 49152, while the sum is 40.

The square root of 28382881 is about 5327.5586341213. The cubic root of 28382881 is about 305.0367455504.

The spelling of 28382881 in words is "twenty-eight million, three hundred eighty-two thousand, eight hundred eighty-one".