28668397 has 8 divisors (see below), whose sum is σ = 31151360. Its totient is φ = 26282880.

The previous prime is 28668379. The next prime is 28668421. The reversal of 28668397 is 79386682.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28668397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28668397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28668317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23748 + ... + 24925.

It is an arithmetic number, because the mean of its divisors is an integer number (3893920).

Almost surely, 2^28668397 is an apocalyptic number.

It is an amenable number.

28668397 is a deficient number, since it is larger than the sum of its proper divisors (2482963).

28668397 is a wasteful number, since it uses less digits than its factorization.

28668397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48723.

The product of its digits is 870912, while the sum is 49.

The square root of 28668397 is about 5354.2877210699. The cubic root of 28668397 is about 306.0561682247.

The spelling of 28668397 in words is "twenty-eight million, six hundred sixty-eight thousand, three hundred ninety-seven".