11987642880 has 120 divisors (see below), whose sum is σ = 41516658612. Its totient is φ = 3196698624.

The previous prime is 11987642869. The next prime is 11987642893. The reversal of 11987642880 is 8824678911.

It can be written as a sum of positive squares in 2 ways, for example, as 11987622144 + 20736 = 109488^2 + 144^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237109 + ... + 283188.

Almost surely, 2^11987642880 is an apocalyptic number.

11987642880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11987642880 is an abundant number, since it is smaller than the sum of its proper divisors (29529015732).

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

11987642880 is an equidigital number, since it uses as much as digits as its factorization.

11987642880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520326 (or 520307 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The spelling of 11987642880 in words is "eleven billion, nine hundred eighty-seven million, six hundred forty-two thousand, eight hundred eighty".