11289880 has 64 divisors (see below), whose sum is σ = 29551680. Its totient is φ = 3801600.

The previous prime is 11289877. The next prime is 11289899. The reversal of 11289880 is 8898211.

It is a super-2 number, since 2×11289880² = 254922780828800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16750 + ... + 17410.

It is an arithmetic number, because the mean of its divisors is an integer number (461745).

Almost surely, 2^11289880 is an apocalyptic number.

11289880 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 11289880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14775840).

11289880 is an abundant number, since it is smaller than the sum of its proper divisors (18261800).

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

11289880 is a wasteful number, since it uses less digits than its factorization.

11289880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740 (or 736 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 11289880 is about 3360.0416664083. The cubic root of 11289880 is about 224.3346931163.

The spelling of 11289880 in words is "eleven million, two hundred eighty-nine thousand, eight hundred eighty".