28668677 has 4 divisors (see below), whose sum is σ = 28680000. Its totient is φ = 28657356.

The previous prime is 28668667. The next prime is 28668683. The reversal of 28668677 is 77686682.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28668677 - 2⁸ = 28668421 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 (28668667) 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 3 ways as a sum of consecutive naturals, for example, 74 + ... + 7572.

It is an arithmetic number, because the mean of its divisors is an integer number (7170000).

Almost surely, 2^28668677 is an apocalyptic number.

It is an amenable number.

28668677 is a deficient number, since it is larger than the sum of its proper divisors (11323).

28668677 is an equidigital number, since it uses as much as digits as its factorization.

28668677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11322.

The product of its digits is 1354752, while the sum is 50.

The square root of 28668677 is about 5354.3138682748. The cubic root of 28668677 is about 306.0571646232.

The spelling of 28668677 in words is "twenty-eight million, six hundred sixty-eight thousand, six hundred seventy-seven".