28097911 has 8 divisors (see below), whose sum is σ = 29126240. Its totient is φ = 27083808.

The previous prime is 28097813. The next prime is 28097921. The reversal of 28097911 is 11979082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28097911 - 2¹⁷ = 27966839 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28097921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550 + ... + 7516.

It is an arithmetic number, because the mean of its divisors is an integer number (3640780).

Almost surely, 2^28097911 is an apocalyptic number.

28097911 is a deficient number, since it is larger than the sum of its proper divisors (1028329).

28097911 is a wasteful number, since it uses less digits than its factorization.

28097911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7113.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 28097911 is about 5300.7462682154. The cubic root of 28097911 is about 304.0124324036.

The spelling of 28097911 in words is "twenty-eight million, ninety-seven thousand, nine hundred eleven".