11213987328 has 240 divisors, whose sum is σ = 33821804016. Its totient is φ = 3709255680.

The previous prime is 11213987299. The next prime is 11213987363. The reversal of 11213987328 is 82378931211.

11213987328 is a `hidden beast` number, since 112 + 139 + 87 + 328 = 666.

It is a congruent number.

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, 21523708 + ... + 21524228.

Almost surely, 2^11213987328 is an apocalyptic number.

11213987328 is a gapful number since it is divisible by the number (18) 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 11213987328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16910902008).

11213987328 is an abundant number, since it is smaller than the sum of its proper divisors (22607816688).

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

11213987328 is an frugal number, since it uses more digits than its factorization.

11213987328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727 (or 699 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The spelling of 11213987328 in words is "eleven billion, two hundred thirteen million, nine hundred eighty-seven thousand, three hundred twenty-eight".