28113863 has 16 divisors (see below), whose sum is σ = 30474240. Its totient is φ = 25855200.

The previous prime is 28113859. The next prime is 28113893. The reversal of 28113863 is 36831182.

It is a happy number.

It is not a de Polignac number, because 28113863 - 2² = 28113859 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 (28113853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147098 + ... + 147288.

It is an arithmetic number, because the mean of its divisors is an integer number (1904640).

Almost surely, 2^28113863 is an apocalyptic number.

28113863 is a deficient number, since it is larger than the sum of its proper divisors (2360377).

28113863 is a wasteful number, since it uses less digits than its factorization.

28113863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398.

The product of its digits is 6912, while the sum is 32.

The square root of 28113863 is about 5302.2507485029. The cubic root of 28113863 is about 304.0699537481.

The spelling of 28113863 in words is "twenty-eight million, one hundred thirteen thousand, eight hundred sixty-three".