11981328 has 40 divisors (see below), whose sum is σ = 32774688. Its totient is φ = 3758592.

The previous prime is 11981317. The next prime is 11981329. The reversal of 11981328 is 82318911.

It is not an unprimeable number, because it can be changed into a prime (11981329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6526 + ... + 8157.

Almost surely, 2^11981328 is an apocalyptic number.

It is an amenable number.

11981328 is an abundant number, since it is smaller than the sum of its proper divisors (20793360).

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

11981328 is a wasteful number, since it uses less digits than its factorization.

11981328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14711 (or 14705 counting only the distinct ones).

The product of its digits is 3456, while the sum is 33.

The square root of 11981328 is about 3461.4054948821. The cubic root of 11981328 is about 228.8240418442.

The spelling of 11981328 in words is "eleven million, nine hundred eighty-one thousand, three hundred twenty-eight".