28186000 has 80 divisors (see below), whose sum is σ = 72249840. Its totient is φ = 10598400.

The previous prime is 28185959. The next prime is 28186009. The reversal of 28186000 is 68182.

It can be written as a sum of positive squares in 8 ways, for example, as 4682896 + 23503104 = 2164^2 + 4848^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (28186009) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 33586 + ... + 34414.

It is an arithmetic number, because the mean of its divisors is an integer number (903123).

Almost surely, 2^28186000 is an apocalyptic number.

28186000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28186000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36124920).

28186000 is an abundant number, since it is smaller than the sum of its proper divisors (44063840).

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

28186000 is a wasteful number, since it uses less digits than its factorization.

28186000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869 (or 853 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28186000 is about 5309.0488790366. The cubic root of 28186000 is about 304.3298013578.

The spelling of 28186000 in words is "twenty-eight million, one hundred eighty-six thousand".