12731328 has 126 divisors (see below), whose sum is σ = 39346632. Its totient is φ = 3928320.

The previous prime is 12731281. The next prime is 12731339. The reversal of 12731328 is 82313721.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 410673 + ... + 410703.

Almost surely, 2^12731328 is an apocalyptic number.

12731328 is a gapful number since it is divisible by the number (18) 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 12731328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19673316).

12731328 is an abundant number, since it is smaller than the sum of its proper divisors (26615304).

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

12731328 is a wasteful number, since it uses less digits than its factorization.

12731328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 59 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 12731328 is about 3568.0986533447. The cubic root of 12731328 is about 233.5023392356.

It can be divided in two parts, 1273 and 1328, that added together give a square (2601 = 51²).

The spelling of 12731328 in words is "twelve million, seven hundred thirty-one thousand, three hundred twenty-eight".