11217280 has 64 divisors (see below), whose sum is σ = 28421280. Its totient is φ = 4218880.

The previous prime is 11217251. The next prime is 11217301. The reversal of 11217280 is 8271211.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

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, 10365 + ... + 11395.

Almost surely, 2^11217280 is an apocalyptic number.

11217280 is a gapful number since it is divisible by the number (10) 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 11217280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14210640).

11217280 is an abundant number, since it is smaller than the sum of its proper divisors (17204000).

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

11217280 is a wasteful number, since it uses less digits than its factorization.

11217280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067 (or 1055 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 11217280 is about 3349.2208049037. The cubic root of 11217280 is about 223.8527944389.

Adding to 11217280 its reverse (8271211), we get a palindrome (19488491).

The spelling of 11217280 in words is "eleven million, two hundred seventeen thousand, two hundred eighty".