28136000 has 56 divisors (see below), whose sum is σ = 69698616. Its totient is φ = 11251200.

The previous prime is 28135999. The next prime is 28136011. The reversal of 28136000 is 63182.

It can be written as a sum of positive squares in 4 ways, for example, as 173056 + 27962944 = 416^2 + 5288^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6242 + ... + 9758.

Almost surely, 2^28136000 is an apocalyptic number.

28136000 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 28136000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34849308).

28136000 is an abundant number, since it is smaller than the sum of its proper divisors (41562616).

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

28136000 is an equidigital number, since it uses as much as digits as its factorization.

28136000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3544 (or 3524 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 28136000 is about 5304.3378474603. The cubic root of 28136000 is about 304.1497415573.

Adding to 28136000 its reverse (63182), we get a palindrome (28199182).

The spelling of 28136000 in words is "twenty-eight million, one hundred thirty-six thousand".