13664767 has 4 divisors (see below), whose sum is σ = 13998096. Its totient is φ = 13331440.

The previous prime is 13664759. The next prime is 13664789. The reversal of 13664767 is 76746631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76746631 = 13 ⋅5903587.

It is a cyclic number.

It is not a de Polignac number, because 13664767 - 2³ = 13664759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13664747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166603 + ... + 166684.

It is an arithmetic number, because the mean of its divisors is an integer number (3499524).

Almost surely, 2^13664767 is an apocalyptic number.

13664767 is a deficient number, since it is larger than the sum of its proper divisors (333329).

13664767 is an equidigital number, since it uses as much as digits as its factorization.

13664767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333328.

The product of its digits is 127008, while the sum is 40.

The square root of 13664767 is about 3696.5885624451. The cubic root of 13664767 is about 239.0749518369.

The spelling of 13664767 in words is "thirteen million, six hundred sixty-four thousand, seven hundred sixty-seven".