28380097 has 4 divisors (see below), whose sum is σ = 29295616. Its totient is φ = 27464580.

The previous prime is 28380083. The next prime is 28380113. The reversal of 28380097 is 79008382.

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 a de Polignac number, because none of the positive numbers 2^k-28380097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28380397) 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, 457713 + ... + 457774.

It is an arithmetic number, because the mean of its divisors is an integer number (7323904).

Almost surely, 2^28380097 is an apocalyptic number.

It is an amenable number.

28380097 is a deficient number, since it is larger than the sum of its proper divisors (915519).

28380097 is an equidigital number, since it uses as much as digits as its factorization.

28380097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915518.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 28380097 is about 5327.2973448082. The cubic root of 28380097 is about 305.0267718146.

The spelling of 28380097 in words is "twenty-eight million, three hundred eighty thousand, ninety-seven".