667654 has 8 divisors (see below), whose sum is σ = 1078560. Its totient is φ = 308136.

The previous prime is 667649. The next prime is 667657. The reversal of 667654 is 456766.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12814 + ... + 12865.

It is an arithmetic number, because the mean of its divisors is an integer number (134820).

2⁶⁶⁷⁶⁵⁴ is an apocalyptic number.

667654 is a deficient number, since it is larger than the sum of its proper divisors (410906).

667654 is a wasteful number, since it uses less digits than its factorization.

667654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25694.

The product of its digits is 30240, while the sum is 34.

The square root of 667654 is about 817.1009729525. The cubic root of 667654 is about 87.4011509570.

The spelling of 667654 in words is "six hundred sixty-seven thousand, six hundred fifty-four".