13878816 has 96 divisors (see below), whose sum is σ = 43868160. Its totient is φ = 3753216.

The previous prime is 13878803. The next prime is 13878841. The reversal of 13878816 is 61887831.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12225 + ... + 13311.

It is an arithmetic number, because the mean of its divisors is an integer number (456960).

Almost surely, 2^13878816 is an apocalyptic number.

13878816 is a gapful number since it is divisible by the number (16) 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 13878816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21934080).

13878816 is an abundant number, since it is smaller than the sum of its proper divisors (29989344).

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

13878816 is a wasteful number, since it uses less digits than its factorization.

13878816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126 (or 1118 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 13878816 is about 3725.4282975250. The cubic root of 13878816 is about 240.3168038520.

The spelling of 13878816 in words is "thirteen million, eight hundred seventy-eight thousand, eight hundred sixteen".