11973742720 has 64 divisors (see below), whose sum is σ = 29611834200. Its totient is φ = 4624334848.

The previous prime is 11973742699. The next prime is 11973742721. The reversal of 11973742720 is 2724737911.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6939556416 + 5034186304 = 83304^2 + 70952^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (11973742721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304009 + ... + 341128.

Almost surely, 2^11973742720 is an apocalyptic number.

11973742720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11973742720 is an abundant number, since it is smaller than the sum of its proper divisors (17638091480).

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

11973742720 is an equidigital number, since it uses as much as digits as its factorization.

11973742720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645185 (or 645173 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 43.

The spelling of 11973742720 in words is "eleven billion, nine hundred seventy-three million, seven hundred forty-two thousand, seven hundred twenty".