28668377 has 4 divisors (see below), whose sum is σ = 29443236. Its totient is φ = 27893520.

The previous prime is 28668371. The next prime is 28668379. The reversal of 28668377 is 77386682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20693401 + 7974976 = 4549^2 + 2824^2 .

It is a cyclic number.

It is not a de Polignac number, because 28668377 - 2⁶ = 28668313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28668371) 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, 387374 + ... + 387447.

It is an arithmetic number, because the mean of its divisors is an integer number (7360809).

Almost surely, 2^28668377 is an apocalyptic number.

It is an amenable number.

28668377 is a deficient number, since it is larger than the sum of its proper divisors (774859).

28668377 is an equidigital number, since it uses as much as digits as its factorization.

28668377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774858.

The product of its digits is 677376, while the sum is 47.

The square root of 28668377 is about 5354.2858534075. The cubic root of 28668377 is about 306.0560970531.

The spelling of 28668377 in words is "twenty-eight million, six hundred sixty-eight thousand, three hundred seventy-seven".