13664278 has 8 divisors (see below), whose sum is σ = 21203280. Its totient is φ = 6596520.

The previous prime is 13664257. The next prime is 13664279. The reversal of 13664278 is 87246631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×13664278² = 373424986522568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13664279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117738 + ... + 117853.

It is an arithmetic number, because the mean of its divisors is an integer number (2650410).

Almost surely, 2^13664278 is an apocalyptic number.

13664278 is a deficient number, since it is larger than the sum of its proper divisors (7539002).

13664278 is a wasteful number, since it uses less digits than its factorization.

13664278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235622.

The product of its digits is 48384, while the sum is 37.

The square root of 13664278 is about 3696.5224197886. The cubic root of 13664278 is about 239.0721000004.

The spelling of 13664278 in words is "thirteen million, six hundred sixty-four thousand, two hundred seventy-eight".