668067828 has 12 divisors (see below), whose sum is σ = 1558824960. Its totient is φ = 222689272.

The previous prime is 668067761. The next prime is 668067859. The reversal of 668067828 is 828760866.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27836148 + ... + 27836171.

It is an arithmetic number, because the mean of its divisors is an integer number (129902080).

Almost surely, 2^668067828 is an apocalyptic number.

It is an amenable number.

668067828 is an abundant number, since it is smaller than the sum of its proper divisors (890757132).

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

668067828 is a wasteful number, since it uses less digits than its factorization.

668067828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55672326 (or 55672324 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 51.

The square root of 668067828 is about 25847.0081053881. The cubic root of 668067828 is about 874.1920500557.

The spelling of 668067828 in words is "six hundred sixty-eight million, sixty-seven thousand, eight hundred twenty-eight".