11981568 has 36 divisors (see below), whose sum is σ = 31890488. Its totient is φ = 3993600.

The previous prime is 11981443. The next prime is 11981587. The reversal of 11981568 is 86518911.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7033 + ... + 8568.

Almost surely, 2^11981568 is an apocalyptic number.

It is an amenable number.

11981568 is an abundant number, since it is smaller than the sum of its proper divisors (19908920).

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

11981568 is an equidigital number, since it uses as much as digits as its factorization.

11981568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15620 (or 15606 counting only the distinct ones).

The product of its digits is 17280, while the sum is 39.

The square root of 11981568 is about 3461.4401627068. The cubic root of 11981568 is about 228.8255697050.

The spelling of 11981568 in words is "eleven million, nine hundred eighty-one thousand, five hundred sixty-eight".