11891214720 has 896 divisors, whose sum is σ = 53299226880. Its totient is φ = 2463436800.

The previous prime is 11891214719. The next prime is 11891214737. The reversal of 11891214720 is 2741219811.

11891214720 is a `hidden beast` number, since 1 + 189 + 1 + 2 + 1 + 472 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (896).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 35924955 + ... + 35925285.

Almost surely, 2^11891214720 is an apocalyptic number.

11891214720 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 11891214720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26649613440).

11891214720 is an abundant number, since it is smaller than the sum of its proper divisors (41408012160).

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

11891214720 is an equidigital number, since it uses as much as digits as its factorization.

11891214720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The spelling of 11891214720 in words is "eleven billion, eight hundred ninety-one million, two hundred fourteen thousand, seven hundred twenty".