13687278 has 48 divisors (see below), whose sum is σ = 31888080. Its totient is φ = 3900160.

The previous prime is 13687253. The next prime is 13687279. The reversal of 13687278 is 87278631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13687279) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11788 + ... + 12896.

It is an arithmetic number, because the mean of its divisors is an integer number (664335).

Almost surely, 2^13687278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13687278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15944040).

13687278 is an abundant number, since it is smaller than the sum of its proper divisors (18200802).

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

13687278 is a wasteful number, since it uses less digits than its factorization.

13687278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153 (or 1142 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 13687278 is about 3699.6321438759. The cubic root of 13687278 is about 239.2061618715.

It can be divided in two parts, 1368 and 7278, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 13687278 in words is "thirteen million, six hundred eighty-seven thousand, two hundred seventy-eight".