1668763028 has 6 divisors (see below), whose sum is σ = 2920335306. Its totient is φ = 834381512.

The previous prime is 1668763013. The next prime is 1668763051. The reversal of 1668763028 is 8203678661.

It can be written as a sum of positive squares in only one way, i.e., 1330644484 + 338118544 = 36478^2 + 18388^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 208595375 + ... + 208595382.

It is an arithmetic number, because the mean of its divisors is an integer number (486722551).

Almost surely, 2^1668763028 is an apocalyptic number.

It is an amenable number.

1668763028 is a deficient number, since it is larger than the sum of its proper divisors (1251572278).

1668763028 is a wasteful number, since it uses less digits than its factorization.

1668763028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417190761 (or 417190759 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 1668763028 is about 40850.4960557396. The cubic root of 1668763028 is about 1186.1279954604.

The spelling of 1668763028 in words is "one billion, six hundred sixty-eight million, seven hundred sixty-three thousand, twenty-eight".