668806244 has 12 divisors (see below), whose sum is σ = 1181999868. Its totient is φ = 331092000.

The previous prime is 668806199. The next prime is 668806267. The reversal of 668806244 is 442608866.

It can be written as a sum of positive squares in 2 ways, for example, as 461734144 + 207072100 = 21488^2 + 14390^2 .

It is a junction number, because it is equal to n+sod(n) for n = 668806195 and 668806204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 827327 + ... + 828134.

It is an arithmetic number, because the mean of its divisors is an integer number (98499989).

Almost surely, 2^668806244 is an apocalyptic number.

It is an amenable number.

668806244 is a deficient number, since it is larger than the sum of its proper divisors (513193624).

668806244 is a wasteful number, since it uses less digits than its factorization.

668806244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655566 (or 1655564 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 44.

The square root of 668806244 is about 25861.2885216495. The cubic root of 668806244 is about 874.5140132284.

The spelling of 668806244 in words is "six hundred sixty-eight million, eight hundred six thousand, two hundred forty-four".