28088961 has 4 divisors (see below), whose sum is σ = 37451952. Its totient is φ = 18725972.

The previous prime is 28088959. The next prime is 28088989. The reversal of 28088961 is 16988082.

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 28088961 - 2¹ = 28088959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28088161) 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, 4681491 + ... + 4681496.

It is an arithmetic number, because the mean of its divisors is an integer number (9362988).

Almost surely, 2^28088961 is an apocalyptic number.

It is an amenable number.

28088961 is a deficient number, since it is larger than the sum of its proper divisors (9362991).

28088961 is an equidigital number, since it uses as much as digits as its factorization.

28088961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9362990.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 28088961 is about 5299.9019802257. The cubic root of 28088961 is about 303.9801500486.

The spelling of 28088961 in words is "twenty-eight million, eighty-eight thousand, nine hundred sixty-one".