12420047720 has 64 divisors (see below), whose sum is σ = 28363288320. Its totient is φ = 4893848064.

The previous prime is 12420047671. The next prime is 12420047723. The reversal of 12420047720 is 2774002421.

It is not an unprimeable number, because it can be changed into a prime (12420047723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2868197 + ... + 2872523.

It is an arithmetic number, because the mean of its divisors is an integer number (443176380).

Almost surely, 2^12420047720 is an apocalyptic number.

12420047720 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 12420047720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14181644160).

12420047720 is an abundant number, since it is smaller than the sum of its proper divisors (15943240600).

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

12420047720 is a wasteful number, since it uses less digits than its factorization.

12420047720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5394 (or 5390 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 29.

The spelling of 12420047720 in words is "twelve billion, four hundred twenty million, forty-seven thousand, seven hundred twenty".