28147868 has 24 divisors (see below), whose sum is σ = 56412384. Its totient is φ = 12038400.

The previous prime is 28147859. The next prime is 28147913. The reversal of 28147868 is 86874182.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20648 + ... + 21968.

It is an arithmetic number, because the mean of its divisors is an integer number (2350516).

Almost surely, 2^28147868 is an apocalyptic number.

28147868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28147868 is an abundant number, since it is smaller than the sum of its proper divisors (28264516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28147868 is a wasteful number, since it uses less digits than its factorization.

28147868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2093 (or 2091 counting only the distinct ones).

The product of its digits is 172032, while the sum is 44.

The square root of 28147868 is about 5305.4564365378. The cubic root of 28147868 is about 304.1924998471.

The spelling of 28147868 in words is "twenty-eight million, one hundred forty-seven thousand, eight hundred sixty-eight".