16664378 has 8 divisors (see below), whose sum is σ = 25031700. Its totient is φ = 8320480.

The previous prime is 16664377. The next prime is 16664399. The reversal of 16664378 is 87346661.

It can be written as a sum of positive squares in 2 ways, for example, as 10647169 + 6017209 = 3263^2 + 2453^2 .

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

It is not an unprimeable number, because it can be changed into a prime (16664377) 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, 3953 + ... + 6996.

Almost surely, 2^16664378 is an apocalyptic number.

16664378 is a deficient number, since it is larger than the sum of its proper divisors (8367322).

16664378 is a wasteful number, since it uses less digits than its factorization.

16664378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11712.

The product of its digits is 145152, while the sum is 41.

The square root of 16664378 is about 4082.2025917389. The cubic root of 16664378 is about 255.4247847503.

The spelling of 16664378 in words is "sixteen million, six hundred sixty-four thousand, three hundred seventy-eight".