11998493280 has 384 divisors, whose sum is σ = 43030310400. Its totient is φ = 3121846272.

The previous prime is 11998493251. The next prime is 11998493281. The reversal of 11998493280 is 8239489911.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11998493281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39082887 + ... + 39083193.

It is an arithmetic number, because the mean of its divisors is an integer number (112058100).

Almost surely, 2^11998493280 is an apocalyptic number.

11998493280 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 11998493280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21515155200).

11998493280 is an abundant number, since it is smaller than the sum of its proper divisors (31031817120).

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

11998493280 is a wasteful number, since it uses less digits than its factorization.

11998493280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 11998493280 in words is "eleven billion, nine hundred ninety-eight million, four hundred ninety-three thousand, two hundred eighty".