668448844 has 24 divisors (see below), whose sum is σ = 1343245568. Its totient is φ = 285117840.

The previous prime is 668448817. The next prime is 668448863. The reversal of 668448844 is 448844866.

668448844 = T₁₁₂ + T₁₁₃ + ... + T₁₅₈₈.

It is a junction number, because it is equal to n+sod(n) for n = 668448791 and 668448800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50664 + ... + 62479.

Almost surely, 2^668448844 is an apocalyptic number.

It is an amenable number.

668448844 is an abundant number, since it is smaller than the sum of its proper divisors (674796724).

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

668448844 is a wasteful number, since it uses less digits than its factorization.

668448844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113365 (or 113363 counting only the distinct ones).

The product of its digits is 4718592, while the sum is 52.

The square root of 668448844 is about 25854.3776564047. The cubic root of 668448844 is about 874.3582097592.

The spelling of 668448844 in words is "six hundred sixty-eight million, four hundred forty-eight thousand, eight hundred forty-four".