668936862 has 48 divisors (see below), whose sum is σ = 1582953840. Its totient is φ = 202473600.

The previous prime is 668936839. The next prime is 668936897. The reversal of 668936862 is 268639866.

It is a junction number, because it is equal to n+sod(n) for n = 668936799 and 668936808.

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 23 ways as a sum of consecutive naturals, for example, 253912 + ... + 256532.

It is an arithmetic number, because the mean of its divisors is an integer number (32978205).

Almost surely, 2^668936862 is an apocalyptic number.

668936862 is an abundant number, since it is smaller than the sum of its proper divisors (914016978).

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

668936862 is a wasteful number, since it uses less digits than its factorization.

668936862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3929 (or 3926 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The square root of 668936862 is about 25863.8137559023. The cubic root of 668936862 is about 874.5709404461.

The spelling of 668936862 in words is "six hundred sixty-eight million, nine hundred thirty-six thousand, eight hundred sixty-two".