12781288 has 32 divisors (see below), whose sum is σ = 26258400. Its totient is φ = 5796288.

The previous prime is 12781271. The next prime is 12781291. The reversal of 12781288 is 88218721.

It is a super-2 number, since 2×12781288² = 326722645877888, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5095 + ... + 7177.

It is an arithmetic number, because the mean of its divisors is an integer number (820575).

Almost surely, 2^12781288 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 12781288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13129200).

12781288 is an abundant number, since it is smaller than the sum of its proper divisors (13477112).

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

12781288 is a wasteful number, since it uses less digits than its factorization.

12781288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161 (or 2157 counting only the distinct ones).

The product of its digits is 14336, while the sum is 37.

The square root of 12781288 is about 3575.0927260702. The cubic root of 12781288 is about 233.8073755083.

The spelling of 12781288 in words is "twelve million, seven hundred eighty-one thousand, two hundred eighty-eight".