668716 has 12 divisors (see below), whose sum is σ = 1195488. Its totient is φ = 327152.

The previous prime is 668713. The next prime is 668719. The reversal of 668716 is 617866.

It is an interprime number because it is at equal distance from previous prime (668713) and next prime (668719).

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (668713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1591 + ... + 1966.

It is an arithmetic number, because the mean of its divisors is an integer number (99624).

2⁶⁶⁸⁷¹⁶ is an apocalyptic number.

It is an amenable number.

668716 is a deficient number, since it is larger than the sum of its proper divisors (526772).

668716 is a wasteful number, since it uses less digits than its factorization.

668716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3608 (or 3606 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 668716 is about 817.7505732190. The cubic root of 668716 is about 87.4474677874.

The spelling of 668716 in words is "six hundred sixty-eight thousand, seven hundred sixteen".