28098897 has 4 divisors (see below), whose sum is σ = 37465200. Its totient is φ = 18732596.

The previous prime is 28098887. The next prime is 28098937. The reversal of 28098897 is 79889082.

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 28098897 - 2⁷ = 28098769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28098887) 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, 4683147 + ... + 4683152.

It is an arithmetic number, because the mean of its divisors is an integer number (9366300).

Almost surely, 2^28098897 is an apocalyptic number.

It is an amenable number.

28098897 is a deficient number, since it is larger than the sum of its proper divisors (9366303).

28098897 is an equidigital number, since it uses as much as digits as its factorization.

28098897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9366302.

The product of its (nonzero) digits is 580608, while the sum is 51.

The square root of 28098897 is about 5300.8392731717. The cubic root of 28098897 is about 304.0159884539.

The spelling of 28098897 in words is "twenty-eight million, ninety-eight thousand, eight hundred ninety-seven".