28028097 has 24 divisors (see below), whose sum is σ = 43330560. Its totient is φ = 17405280.

The previous prime is 28028081. The next prime is 28028101. The reversal of 28028097 is 79082082.

It is not a de Polignac number, because 28028097 - 2⁴ = 28028081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28028057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9088 + ... + 11774.

It is an arithmetic number, because the mean of its divisors is an integer number (1805440).

Almost surely, 2^28028097 is an apocalyptic number.

It is an amenable number.

28028097 is a deficient number, since it is larger than the sum of its proper divisors (15302463).

28028097 is a wasteful number, since it uses less digits than its factorization.

28028097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2773 (or 2770 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 28028097 is about 5294.1568733841. The cubic root of 28028097 is about 303.7604335186.

The spelling of 28028097 in words is "twenty-eight million, twenty-eight thousand, ninety-seven".