668847456 has 240 divisors, whose sum is σ = 2137245264. Its totient is φ = 204374016.

The previous prime is 668847433. The next prime is 668847457. The reversal of 668847456 is 654748866.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668847457) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 1894576 + ... + 1894928.

Almost surely, 2^668847456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668847456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1068622632).

668847456 is an abundant number, since it is smaller than the sum of its proper divisors (1468397808).

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

668847456 is a wasteful number, since it uses less digits than its factorization.

668847456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435 (or 418 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 54.

The square root of 668847456 is about 25862.0852987535. The cubic root of 668847456 is about 874.5319754467.

The spelling of 668847456 in words is "six hundred sixty-eight million, eight hundred forty-seven thousand, four hundred fifty-six".