28187000 has 64 divisors (see below), whose sum is σ = 67055040. Its totient is φ = 11088000.

The previous prime is 28186987. The next prime is 28187009. The reversal of 28187000 is 78182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28187009) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 70802 + ... + 71198.

It is an arithmetic number, because the mean of its divisors is an integer number (1047735).

Almost surely, 2^28187000 is an apocalyptic number.

28187000 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 28187000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33527520).

28187000 is an abundant number, since it is smaller than the sum of its proper divisors (38868040).

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

28187000 is a wasteful number, since it uses less digits than its factorization.

28187000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 28187000 is about 5309.1430570291. The cubic root of 28187000 is about 304.3334003810. Note that the first 3 decimals are identical.

The spelling of 28187000 in words is "twenty-eight million, one hundred eighty-seven thousand".