668711128 has 16 divisors (see below), whose sum is σ = 1259360280. Its totient is φ = 332881728.

The previous prime is 668711119. The next prime is 668711143. The reversal of 668711128 is 821117866.

It is a super-2 number, since 2×668711128² = 894349145422064768, 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, 182301 + ... + 185932.

Almost surely, 2^668711128 is an apocalyptic number.

It is an amenable number.

668711128 is a deficient number, since it is larger than the sum of its proper divisors (590649152).

668711128 is a wasteful number, since it uses less digits than its factorization.

668711128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368466 (or 368462 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 668711128 is about 25859.4494914335. The cubic root of 668711128 is about 874.4725541765.

The spelling of 668711128 in words is "six hundred sixty-eight million, seven hundred eleven thousand, one hundred twenty-eight".