13278864 has 40 divisors (see below), whose sum is σ = 34824160. Its totient is φ = 4359168.

The previous prime is 13278851. The next prime is 13278869. The reversal of 13278864 is 46887231.

It is not an unprimeable number, because it can be changed into a prime (13278869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1152 + ... + 5280.

It is an arithmetic number, because the mean of its divisors is an integer number (870604).

Almost surely, 2^13278864 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 13278864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17412080).

13278864 is an abundant number, since it is smaller than the sum of its proper divisors (21545296).

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

13278864 is a wasteful number, since it uses less digits than its factorization.

13278864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4207 (or 4201 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 13278864 is about 3644.0175630751. The cubic root of 13278864 is about 236.8028769129.

The spelling of 13278864 in words is "thirteen million, two hundred seventy-eight thousand, eight hundred sixty-four".