12655720 has 96 divisors (see below), whose sum is σ = 36197280. Its totient is φ = 3937920.

The previous prime is 12655703. The next prime is 12655733. The reversal of 12655720 is 2755621.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21267 + ... + 21853.

It is an arithmetic number, because the mean of its divisors is an integer number (377055).

Almost surely, 2^12655720 is an apocalyptic number.

12655720 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 12655720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18098640).

12655720 is an abundant number, since it is smaller than the sum of its proper divisors (23541560).

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

12655720 is a wasteful number, since it uses less digits than its factorization.

12655720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 12655720 is about 3557.4878777025. The cubic root of 12655720 is about 233.0391848972.

Subtracting from 12655720 its reverse (2755621), we obtain a palindrome (9900099).

The spelling of 12655720 in words is "twelve million, six hundred fifty-five thousand, seven hundred twenty".