11931887520 has 576 divisors, whose sum is σ = 50417821440. Its totient is φ = 2581383168.

The previous prime is 11931887519. The next prime is 11931887531. The reversal of 11931887520 is 2578813911.

11931887520 is a `hidden beast` number, since 1 + 19 + 31 + 8 + 87 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10916094 + ... + 10917186.

It is an arithmetic number, because the mean of its divisors is an integer number (87530940).

Almost surely, 2^11931887520 is an apocalyptic number.

11931887520 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 11931887520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25208910720).

11931887520 is an abundant number, since it is smaller than the sum of its proper divisors (38485933920).

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

11931887520 is a wasteful number, since it uses less digits than its factorization.

11931887520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162 (or 1129 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The spelling of 11931887520 in words is "eleven billion, nine hundred thirty-one million, eight hundred eighty-seven thousand, five hundred twenty".