28188756 has 48 divisors (see below), whose sum is σ = 73487680. Its totient is φ = 9344160.

The previous prime is 28188697. The next prime is 28188757. The reversal of 28188756 is 65788182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28188757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22170 + ... + 23406.

Almost surely, 2^28188756 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28188756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36743840).

28188756 is an abundant number, since it is smaller than the sum of its proper divisors (45298924).

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

28188756 is a wasteful number, since it uses less digits than its factorization.

28188756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461 (or 1453 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 28188756 is about 5309.3084295415. The cubic root of 28188756 is about 304.3397200598.

The spelling of 28188756 in words is "twenty-eight million, one hundred eighty-eight thousand, seven hundred fifty-six".