667345 has 16 divisors (see below), whose sum is σ = 956160. Its totient is φ = 437184.

The previous prime is 667333. The next prime is 667351. The reversal of 667345 is 543766.

667345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 667345 - 2¹⁵ = 634577 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391 + ... + 1219.

It is an arithmetic number, because the mean of its divisors is an integer number (59760).

2⁶⁶⁷³⁴⁵ is an apocalyptic number.

It is an amenable number.

667345 is a deficient number, since it is larger than the sum of its proper divisors (288815).

667345 is a wasteful number, since it uses less digits than its factorization.

667345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864.

The product of its digits is 15120, while the sum is 31.

The square root of 667345 is about 816.9118679515. The cubic root of 667345 is about 87.3876653676.

The spelling of 667345 in words is "six hundred sixty-seven thousand, three hundred forty-five".