667715 has 4 divisors (see below), whose sum is σ = 801264. Its totient is φ = 534168.

The previous prime is 667699. The next prime is 667727. The reversal of 667715 is 517766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667715 - 2⁴ = 667699 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66767 + ... + 66776.

It is an arithmetic number, because the mean of its divisors is an integer number (200316).

2⁶⁶⁷⁷¹⁵ is an apocalyptic number.

667715 is a deficient number, since it is larger than the sum of its proper divisors (133549).

667715 is a wasteful number, since it uses less digits than its factorization.

667715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133548.

The product of its digits is 8820, while the sum is 32.

The square root of 667715 is about 817.1382991881. The cubic root of 667715 is about 87.4038126689.

The spelling of 667715 in words is "six hundred sixty-seven thousand, seven hundred fifteen".