28168791 has 8 divisors (see below), whose sum is σ = 42923904. Its totient is φ = 16096440.

The previous prime is 28168787. The next prime is 28168807. The reversal of 28168791 is 19786182.

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

It is not a de Polignac number, because 28168791 - 2² = 28168787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28168771) 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, 670665 + ... + 670706.

It is an arithmetic number, because the mean of its divisors is an integer number (5365488).

Almost surely, 2^28168791 is an apocalyptic number.

28168791 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28168791 is a deficient number, since it is larger than the sum of its proper divisors (14755113).

28168791 is a wasteful number, since it uses less digits than its factorization.

28168791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341381.

The product of its digits is 48384, while the sum is 42.

The square root of 28168791 is about 5307.4279081303. The cubic root of 28168791 is about 304.2678524260.

The spelling of 28168791 in words is "twenty-eight million, one hundred sixty-eight thousand, seven hundred ninety-one".