667574 has 4 divisors (see below), whose sum is σ = 1001364. Its totient is φ = 333786.

The previous prime is 667561. The next prime is 667577. The reversal of 667574 is 475766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 475766 = 2 ⋅237883.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667577) by changing a digit.

667574 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 as a sum of consecutive naturals, namely, 166892 + ... + 166895.

It is an arithmetic number, because the mean of its divisors is an integer number (250341).

2⁶⁶⁷⁵⁷⁴ is an apocalyptic number.

667574 is a deficient number, since it is larger than the sum of its proper divisors (333790).

667574 is a wasteful number, since it uses less digits than its factorization.

667574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333789.

The product of its digits is 35280, while the sum is 35.

The square root of 667574 is about 817.0520179279. The cubic root of 667574 is about 87.3976599415.

The spelling of 667574 in words is "six hundred sixty-seven thousand, five hundred seventy-four".