667078 has 4 divisors (see below), whose sum is σ = 1000620. Its totient is φ = 333538.

The previous prime is 667021. The next prime is 667081. The reversal of 667078 is 870766.

667078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166768 + ... + 166771.

It is an arithmetic number, because the mean of its divisors is an integer number (250155).

2⁶⁶⁷⁰⁷⁸ is an apocalyptic number.

667078 is a deficient number, since it is larger than the sum of its proper divisors (333542).

667078 is a wasteful number, since it uses less digits than its factorization.

667078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333541.

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

The square root of 667078 is about 816.7484312810. The cubic root of 667078 is about 87.3760094180.

The spelling of 667078 in words is "six hundred sixty-seven thousand, seventy-eight".