12736224 has 48 divisors (see below), whose sum is σ = 37149840. Its totient is φ = 4245120.

The previous prime is 12736223. The next prime is 12736253. The reversal of 12736224 is 42263721.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×12736224² = 324422803556352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12736223) 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, 6507 + ... + 8234.

It is an arithmetic number, because the mean of its divisors is an integer number (773955).

Almost surely, 2^12736224 is an apocalyptic number.

It is an amenable number.

12736224 is an abundant number, since it is smaller than the sum of its proper divisors (24413616).

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

12736224 is a wasteful number, since it uses less digits than its factorization.

12736224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14760 (or 14746 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 12736224 is about 3568.7846670821. The cubic root of 12736224 is about 233.5322675337.

Adding to 12736224 its reverse (42263721), we get a palindrome (54999945).

The spelling of 12736224 in words is "twelve million, seven hundred thirty-six thousand, two hundred twenty-four".