11815560 has 96 divisors (see below), whose sum is σ = 40098240. Its totient is φ = 3011712.

The previous prime is 11815547. The next prime is 11815571. The reversal of 11815560 is 6551811.

It is a super-2 number, since 2×11815560² = 279214916227200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7567 + ... + 8993.

It is an arithmetic number, because the mean of its divisors is an integer number (417690).

Almost surely, 2^11815560 is an apocalyptic number.

11815560 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 11815560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20049120).

11815560 is an abundant number, since it is smaller than the sum of its proper divisors (28282680).

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

11815560 is a wasteful number, since it uses less digits than its factorization.

11815560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467 (or 1460 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 11815560 is about 3437.3769068870. The cubic root of 11815560 is about 227.7638367214.

The spelling of 11815560 in words is "eleven million, eight hundred fifteen thousand, five hundred sixty".