13243664 has 20 divisors (see below), whose sum is σ = 29325504. Its totient is φ = 5675808.

The previous prime is 13243661. The next prime is 13243717. The reversal of 13243664 is 46634231.

It is a super-2 number, since 2×13243664² = 350789272289792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13243661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59012 + ... + 59235.

Almost surely, 2^13243664 is an apocalyptic number.

13243664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

13243664 is an abundant number, since it is smaller than the sum of its proper divisors (16081840).

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

13243664 is a wasteful number, since it uses less digits than its factorization.

13243664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118262 (or 118256 counting only the distinct ones).

The product of its digits is 10368, while the sum is 29.

The square root of 13243664 is about 3639.1845240383. The cubic root of 13243664 is about 236.5934504282.

Adding to 13243664 its reverse (46634231), we get a palindrome (59877895).

The spelling of 13243664 in words is "thirteen million, two hundred forty-three thousand, six hundred sixty-four".