28098911 has 4 divisors (see below), whose sum is σ = 28122000. Its totient is φ = 28075824.

The previous prime is 28098887. The next prime is 28098937. The reversal of 28098911 is 11989082.

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 28098911 - 2²² = 23904607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28098971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9611 + ... + 12188.

It is an arithmetic number, because the mean of its divisors is an integer number (7030500).

Almost surely, 2^28098911 is an apocalyptic number.

28098911 is a deficient number, since it is larger than the sum of its proper divisors (23089).

28098911 is a wasteful number, since it uses less digits than its factorization.

28098911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23088.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 28098911 is about 5300.8405937172. The cubic root of 28098911 is about 304.0160389449.

The spelling of 28098911 in words is "twenty-eight million, ninety-eight thousand, nine hundred eleven".