28768397 has 4 divisors (see below), whose sum is σ = 32878176. Its totient is φ = 24658620.

The previous prime is 28768379. The next prime is 28768427. The reversal of 28768397 is 79386782.

It is a happy number.

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 not a de Polignac number, because 28768397 - 2¹⁸ = 28506253 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 (28768307) 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, 2054879 + ... + 2054892.

It is an arithmetic number, because the mean of its divisors is an integer number (8219544).

Almost surely, 2^28768397 is an apocalyptic number.

It is an amenable number.

28768397 is a deficient number, since it is larger than the sum of its proper divisors (4109779).

28768397 is an equidigital number, since it uses as much as digits as its factorization.

28768397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109778.

The product of its digits is 1016064, while the sum is 50.

The square root of 28768397 is about 5363.6179021254. The cubic root of 28768397 is about 306.4116130471.

The spelling of 28768397 in words is "twenty-eight million, seven hundred sixty-eight thousand, three hundred ninety-seven".