11998115280 has 280 divisors, whose sum is σ = 42009498720. Its totient is φ = 3185360640.

The previous prime is 11998115257. The next prime is 11998115329. The reversal of 11998115280 is 8251189911.

11998115280 is a `hidden beast` number, since 119 + 9 + 8 + 1 + 1 + 528 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 24435835 + ... + 24436325.

It is an arithmetic number, because the mean of its divisors is an integer number (150033924).

Almost surely, 2^11998115280 is an apocalyptic number.

11998115280 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 11998115280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21004749360).

11998115280 is an abundant number, since it is smaller than the sum of its proper divisors (30011383440).

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

11998115280 is an equidigital number, since it uses as much as digits as its factorization.

11998115280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941 (or 920 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 45.

The spelling of 11998115280 in words is "eleven billion, nine hundred ninety-eight million, one hundred fifteen thousand, two hundred eighty".