668007826 has 16 divisors (see below), whose sum is σ = 1068082200. Its totient is φ = 312244480.

The previous prime is 668007797. The next prime is 668007859. The reversal of 668007826 is 628700866.

It can be written as a sum of positive squares in 4 ways, for example, as 353477601 + 314530225 = 18801^2 + 17735^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 60865 + ... + 70996.

Almost surely, 2^668007826 is an apocalyptic number.

668007826 is a deficient number, since it is larger than the sum of its proper divisors (400074374).

668007826 is a wasteful number, since it uses less digits than its factorization.

668007826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132029.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 668007826 is about 25845.8473647122. The cubic root of 668007826 is about 874.1658776425.

The spelling of 668007826 in words is "six hundred sixty-eight million, seven thousand, eight hundred twenty-six".