28168397 has 8 divisors (see below), whose sum is σ = 29298720. Its totient is φ = 27059760.

The previous prime is 28168381. The next prime is 28168421. The reversal of 28168397 is 79386182.

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 28168397 - 2⁴ = 28168381 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 (28168097) 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, 2747 + ... + 7992.

It is an arithmetic number, because the mean of its divisors is an integer number (3662340).

Almost surely, 2^28168397 is an apocalyptic number.

It is an amenable number.

28168397 is a deficient number, since it is larger than the sum of its proper divisors (1130323).

28168397 is a wasteful number, since it uses less digits than its factorization.

28168397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10843.

The product of its digits is 145152, while the sum is 44.

The square root of 28168397 is about 5307.3907902094. The cubic root of 28168397 is about 304.2664338100.

The spelling of 28168397 in words is "twenty-eight million, one hundred sixty-eight thousand, three hundred ninety-seven".