667774 has 8 divisors (see below), whose sum is σ = 1054440. Its totient is φ = 316296.

The previous prime is 667769. The next prime is 667781. The reversal of 667774 is 477766.

667774 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

667774 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 3 ways as a sum of consecutive naturals, for example, 8749 + ... + 8824.

It is an arithmetic number, because the mean of its divisors is an integer number (131805).

2⁶⁶⁷⁷⁷⁴ is an apocalyptic number.

667774 is a deficient number, since it is larger than the sum of its proper divisors (386666).

667774 is a wasteful number, since it uses less digits than its factorization.

667774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17594.

The product of its digits is 49392, while the sum is 37.

The square root of 667774 is about 817.1743999906. The cubic root of 667774 is about 87.4063869574.

It can be divided in two parts, 667 and 774, that added together give a palindrome (1441).

The spelling of 667774 in words is "six hundred sixty-seven thousand, seven hundred seventy-four".