28116861 has 8 divisors (see below), whose sum is σ = 39694464. Its totient is φ = 17641920.

The previous prime is 28116841. The next prime is 28116937. The reversal of 28116861 is 16861182.

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

It is not a de Polignac number, because 28116861 - 2¹⁰ = 28115837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28116841) 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, 275605 + ... + 275706.

It is an arithmetic number, because the mean of its divisors is an integer number (4961808).

Almost surely, 2^28116861 is an apocalyptic number.

It is an amenable number.

28116861 is a deficient number, since it is larger than the sum of its proper divisors (11577603).

28116861 is a wasteful number, since it uses less digits than its factorization.

28116861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551331.

The product of its digits is 4608, while the sum is 33.

The square root of 28116861 is about 5302.5334510967. The cubic root of 28116861 is about 304.0807618125.

The spelling of 28116861 in words is "twenty-eight million, one hundred sixteen thousand, eight hundred sixty-one".