13643478 has 48 divisors (see below), whose sum is σ = 31187520. Its totient is φ = 4469256.

The previous prime is 13643467. The next prime is 13643527. The reversal of 13643478 is 87434631.

13643478 is a `hidden beast` number, since 1 + 3 + 643 + 4 + 7 + 8 = 666.

13643478 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 a super-2 number, since 2×13643478² = 372288983872968, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32353 + ... + 32771.

It is an arithmetic number, because the mean of its divisors is an integer number (649740).

Almost surely, 2^13643478 is an apocalyptic number.

13643478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13643478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15593760).

13643478 is an abundant number, since it is smaller than the sum of its proper divisors (17544042).

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

13643478 is an equidigital number, since it uses as much as digits as its factorization.

13643478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 491 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 13643478 is about 3693.7078931610. The cubic root of 13643478 is about 238.9507318366.

The spelling of 13643478 in words is "thirteen million, six hundred forty-three thousand, four hundred seventy-eight".