668249456 has 120 divisors (see below), whose sum is σ = 1603446480. Its totient is φ = 268240896.

The previous prime is 668249441. The next prime is 668249459. The reversal of 668249456 is 654942866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668249459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1683050 + ... + 1683446.

It is an arithmetic number, because the mean of its divisors is an integer number (13362054).

Almost surely, 2^668249456 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 668249456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (801723240).

668249456 is an abundant number, since it is smaller than the sum of its proper divisors (935197024).

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

668249456 is a wasteful number, since it uses less digits than its factorization.

668249456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 538 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 50.

The square root of 668249456 is about 25850.5213873918. The cubic root of 668249456 is about 874.2712652492.

The spelling of 668249456 in words is "six hundred sixty-eight million, two hundred forty-nine thousand, four hundred fifty-six".