28668385 has 8 divisors (see below), whose sum is σ = 35588520. Its totient is φ = 22143744.

The previous prime is 28668379. The next prime is 28668421. The reversal of 28668385 is 58386682.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1617984 + 27050401 = 1272^2 + 5201^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28668385 - 2⁷ = 28668257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98712 + ... + 99001.

It is an arithmetic number, because the mean of its divisors is an integer number (4448565).

Almost surely, 2^28668385 is an apocalyptic number.

It is an amenable number.

28668385 is a deficient number, since it is larger than the sum of its proper divisors (6920135).

28668385 is a wasteful number, since it uses less digits than its factorization.

28668385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197747.

The product of its digits is 552960, while the sum is 46.

The square root of 28668385 is about 5354.2866004726. The cubic root of 28668385 is about 306.0561255217.

The spelling of 28668385 in words is "twenty-eight million, six hundred sixty-eight thousand, three hundred eighty-five".