16864478 has 4 divisors (see below), whose sum is σ = 25296720. Its totient is φ = 8432238.

The previous prime is 16864447. The next prime is 16864481. The reversal of 16864478 is 87446861.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4216118 + ... + 4216121.

It is an arithmetic number, because the mean of its divisors is an integer number (6324180).

Almost surely, 2^16864478 is an apocalyptic number.

16864478 is a deficient number, since it is larger than the sum of its proper divisors (8432242).

16864478 is an equidigital number, since it uses as much as digits as its factorization.

16864478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8432241.

The product of its digits is 258048, while the sum is 44.

The square root of 16864478 is about 4106.6382845340. The cubic root of 16864478 is about 256.4430702007.

It can be divided in two parts, 168 and 64478, that added together give a palindrome (64646).

The spelling of 16864478 in words is "sixteen million, eight hundred sixty-four thousand, four hundred seventy-eight".