667478 has 20 divisors (see below), whose sum is σ = 1176420. Its totient is φ = 284004.

The previous prime is 667477. The next prime is 667487. The reversal of 667478 is 874766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4733 + ... + 4871.

It is an arithmetic number, because the mean of its divisors is an integer number (58821).

2⁶⁶⁷⁴⁷⁸ is an apocalyptic number.

667478 is a deficient number, since it is larger than the sum of its proper divisors (508942).

667478 is an equidigital number, since it uses as much as digits as its factorization.

667478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 148 counting only the distinct ones).

The product of its digits is 56448, while the sum is 38.

The square root of 667478 is about 816.9932680261. The cubic root of 667478 is about 87.3934703547.

The spelling of 667478 in words is "six hundred sixty-seven thousand, four hundred seventy-eight".