12891648 has 160 divisors (see below), whose sum is σ = 43211520. Its totient is φ = 3317760.

The previous prime is 12891647. The next prime is 12891649. The reversal of 12891648 is 84619821.

It is an interprime number because it is at equal distance from previous prime (12891647) and next prime (12891649).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891647) 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, 118218 + ... + 118326.

It is an arithmetic number, because the mean of its divisors is an integer number (270072).

Almost surely, 2^12891648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12891648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21605760).

12891648 is an abundant number, since it is smaller than the sum of its proper divisors (30319872).

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

12891648 is a wasteful number, since it uses less digits than its factorization.

12891648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 132 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 12891648 is about 3590.4941164135. The cubic root of 12891648 is about 234.4783843276.

The spelling of 12891648 in words is "twelve million, eight hundred ninety-one thousand, six hundred forty-eight".