668392892 has 12 divisors (see below), whose sum is σ = 1171160760. Its totient is φ = 333775536.

The previous prime is 668392889. The next prime is 668392973. The reversal of 668392892 is 298293866.

It is a happy number.

It is a super-2 number, since 2×668392892² = 893498116152247328, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101642 + ... + 108017.

It is an arithmetic number, because the mean of its divisors is an integer number (97596730).

Almost surely, 2^668392892 is an apocalyptic number.

It is an amenable number.

668392892 is a deficient number, since it is larger than the sum of its proper divisors (502767868).

668392892 is a wasteful number, since it uses less digits than its factorization.

668392892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210460 (or 210458 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 53.

The square root of 668392892 is about 25853.2955732920. The cubic root of 668392892 is about 874.3338132498. Note that the first 3 decimals are identical.

The spelling of 668392892 in words is "six hundred sixty-eight million, three hundred ninety-two thousand, eight hundred ninety-two".