28183988 has 24 divisors (see below), whose sum is σ = 56556864. Its totient is φ = 12038400.

The previous prime is 28183957. The next prime is 28183997. The reversal of 28183988 is 88938182.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7748 + ... + 10788.

It is an arithmetic number, because the mean of its divisors is an integer number (2356536).

Almost surely, 2^28183988 is an apocalyptic number.

28183988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28183988 is an abundant number, since it is smaller than the sum of its proper divisors (28372876).

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

28183988 is a wasteful number, since it uses less digits than its factorization.

28183988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3383 (or 3381 counting only the distinct ones).

The product of its digits is 221184, while the sum is 47.

The square root of 28183988 is about 5308.8593878535. The cubic root of 28183988 is about 304.3225598653.

The spelling of 28183988 in words is "twenty-eight million, one hundred eighty-three thousand, nine hundred eighty-eight".