13409664 has 64 divisors (see below), whose sum is σ = 36426240. Its totient is φ = 4368896.

The previous prime is 13409657. The next prime is 13409681. The reversal of 13409664 is 46690431.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17677 + ... + 18419.

It is an arithmetic number, because the mean of its divisors is an integer number (569160).

Almost surely, 2^13409664 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 13409664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18213120).

13409664 is an abundant number, since it is smaller than the sum of its proper divisors (23016576).

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

13409664 is an equidigital number, since it uses as much as digits as its factorization.

13409664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 13409664 is about 3661.9208074452. The cubic root of 13409664 is about 237.5778596064.

The spelling of 13409664 in words is "thirteen million, four hundred nine thousand, six hundred sixty-four".