12644280 has 192 divisors, whose sum is σ = 46725120. Its totient is φ = 2937600.

The previous prime is 12644267. The next prime is 12644293. The reversal of 12644280 is 8244621.

12644280 is a `hidden beast` number, since 12 + 644 + 2 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (12644267) and next prime (12644293).

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 122709 + ... + 122811.

It is an arithmetic number, because the mean of its divisors is an integer number (243360).

Almost surely, 2^12644280 is an apocalyptic number.

12644280 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 12644280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23362560).

12644280 is an abundant number, since it is smaller than the sum of its proper divisors (34080840).

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

12644280 is a wasteful number, since it uses less digits than its factorization.

12644280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 12644280 is about 3555.8796380080. The cubic root of 12644280 is about 232.9689459863.

The spelling of 12644280 in words is "twelve million, six hundred forty-four thousand, two hundred eighty".