668770 has 8 divisors (see below), whose sum is σ = 1203804. Its totient is φ = 267504.

The previous prime is 668761. The next prime is 668791. The reversal of 668770 is 77866.

It can be written as a sum of positive squares in 2 ways, for example, as 567009 + 101761 = 753^2 + 319^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

668770 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33429 + ... + 33448.

2⁶⁶⁸⁷⁷⁰ is an apocalyptic number.

668770 is a deficient number, since it is larger than the sum of its proper divisors (535034).

668770 is a wasteful number, since it uses less digits than its factorization.

668770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66884.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 668770 is about 817.7835899552. The cubic root of 668770 is about 87.4498215699.

It can be divided in two parts, 66 and 8770, that added together give a square (8836 = 94²).

The spelling of 668770 in words is "six hundred sixty-eight thousand, seven hundred seventy".