12720000 has 160 divisors (see below), whose sum is σ = 43017480. Its totient is φ = 3328000.

The previous prime is 12719977. The next prime is 12720011. The reversal of 12720000 is 2721.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 239974 + ... + 240026.

Almost surely, 2^12720000 is an apocalyptic number.

12720000 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 12720000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21508740).

12720000 is an abundant number, since it is smaller than the sum of its proper divisors (30297480).

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

12720000 is an frugal number, since it uses more digits than its factorization.

12720000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 12720000 is about 3566.5109000254. The cubic root of 12720000 is about 233.4330639433.

Adding to 12720000 its reverse (2721), we get a palindrome (12722721).

The spelling of 12720000 in words is "twelve million, seven hundred twenty thousand".