667716 has 24 divisors (see below), whose sum is σ = 1780800. Its totient is φ = 190752.

The previous prime is 667699. The next prime is 667727. The reversal of 667716 is 617766.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

667716 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 7 ways as a sum of consecutive naturals, for example, 3891 + ... + 4058.

It is an arithmetic number, because the mean of its divisors is an integer number (74200).

2⁶⁶⁷⁷¹⁶ is an apocalyptic number.

It is an amenable number.

667716 is an abundant number, since it is smaller than the sum of its proper divisors (1113084).

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

667716 is a wasteful number, since it uses less digits than its factorization.

667716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7963 (or 7961 counting only the distinct ones).

The product of its digits is 10584, while the sum is 33.

The square root of 667716 is about 817.1389110794. The cubic root of 667716 is about 87.4038563022.

The spelling of 667716 in words is "six hundred sixty-seven thousand, seven hundred sixteen".