11687021280 has 1152 divisors, whose sum is σ = 50800296960. Its totient is φ = 2481684480.

The previous prime is 11687021273. The next prime is 11687021321. The reversal of 11687021280 is 8212078611.

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 191 ways as a sum of consecutive naturals, for example, 315865422 + ... + 315865458.

It is an arithmetic number, because the mean of its divisors is an integer number (44097480).

Almost surely, 2^11687021280 is an apocalyptic number.

11687021280 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 11687021280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25400148480).

11687021280 is an abundant number, since it is smaller than the sum of its proper divisors (39113275680).

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

11687021280 is a wasteful number, since it uses less digits than its factorization.

11687021280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

Adding to 11687021280 its reverse (8212078611), we get a palindrome (19899099891).

The spelling of 11687021280 in words is "eleven billion, six hundred eighty-seven million, twenty-one thousand, two hundred eighty".