11287188 has 60 divisors (see below), whose sum is σ = 32199552. Its totient is φ = 3419280.

The previous prime is 11287163. The next prime is 11287189. The reversal of 11287188 is 88178211.

It is a super-2 number, since 2×11287188² = 254801225894688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11287189) 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 19 ways as a sum of consecutive naturals, for example, 1981 + ... + 5147.

Almost surely, 2^11287188 is an apocalyptic number.

11287188 is a gapful number since it is divisible by the number (18) 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 11287188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16099776).

11287188 is an abundant number, since it is smaller than the sum of its proper divisors (20912364).

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

11287188 is a wasteful number, since it uses less digits than its factorization.

11287188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3194 (or 3183 counting only the distinct ones).

The product of its digits is 7168, while the sum is 36.

The square root of 11287188 is about 3359.6410522554. The cubic root of 11287188 is about 224.3168613059.

The spelling of 11287188 in words is "eleven million, two hundred eighty-seven thousand, one hundred eighty-eight".