11987880 has 64 divisors (see below), whose sum is σ = 36192960. Its totient is φ = 3176448.

The previous prime is 11987863. The next prime is 11987891. The reversal of 11987880 is 8878911.

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, 33784 + ... + 34136.

It is an arithmetic number, because the mean of its divisors is an integer number (565515).

Almost surely, 2^11987880 is an apocalyptic number.

11987880 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 11987880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18096480).

11987880 is an abundant number, since it is smaller than the sum of its proper divisors (24205080).

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

11987880 is a wasteful number, since it uses less digits than its factorization.

11987880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 42.

The square root of 11987880 is about 3462.3518018826. The cubic root of 11987880 is about 228.8657451210.

The spelling of 11987880 in words is "eleven million, nine hundred eighty-seven thousand, eight hundred eighty".