668404802 has 12 divisors (see below), whose sum is σ = 1085663970. Its totient is φ = 308494368.

The previous prime is 668404777. The next prime is 668404811. The reversal of 668404802 is 208404866.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 119486761 + 548918041 = 10931^2 + 23429^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 988427 + ... + 989102.

Almost surely, 2^668404802 is an apocalyptic number.

668404802 is a deficient number, since it is larger than the sum of its proper divisors (417259168).

668404802 is a wasteful number, since it uses less digits than its factorization.

668404802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977557 (or 1977544 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 668404802 is about 25853.5259104053. The cubic root of 668404802 is about 874.3390064298.

The spelling of 668404802 in words is "six hundred sixty-eight million, four hundred four thousand, eight hundred two".