668281000 has 64 divisors (see below), whose sum is σ = 1567874880. Its totient is φ = 266612800.

The previous prime is 668280989. The next prime is 668281027. The reversal of 668281000 is 182866.

It is a super-2 number, since 2×668281000² = 893198989922000000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 562407 + ... + 563593.

It is an arithmetic number, because the mean of its divisors is an integer number (24498045).

Almost surely, 2^668281000 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 668281000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (783937440).

668281000 is an abundant number, since it is smaller than the sum of its proper divisors (899593880).

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

668281000 is a wasteful number, since it uses less digits than its factorization.

668281000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771 (or 1757 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 668281000 is about 25851.1315032824. The cubic root of 668281000 is about 874.2850213791.

The spelling of 668281000 in words is "six hundred sixty-eight million, two hundred eighty-one thousand".