13663878 has 32 divisors (see below), whose sum is σ = 28554720. Its totient is φ = 4354560.

The previous prime is 13663873. The next prime is 13663883. The reversal of 13663878 is 87836631.

13663878 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (13663873) and next prime (13663883).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13663873) 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, 13038 + ... + 14046.

It is an arithmetic number, because the mean of its divisors is an integer number (892335).

Almost surely, 2^13663878 is an apocalyptic number.

13663878 is an abundant number, since it is smaller than the sum of its proper divisors (14890842).

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

13663878 is a wasteful number, since it uses less digits than its factorization.

13663878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112.

The product of its digits is 145152, while the sum is 42.

The square root of 13663878 is about 3696.4683144861. The cubic root of 13663878 is about 239.0697671592.

It can be divided in two parts, 13663 and 878, that added together give a palindrome (14541).

The spelling of 13663878 in words is "thirteen million, six hundred sixty-three thousand, eight hundred seventy-eight".