661208 has 8 divisors (see below), whose sum is σ = 1239780. Its totient is φ = 330600.

The previous prime is 661201. The next prime is 661217. The reversal of 661208 is 802166.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661201) by changing a digit.

661208 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, 41318 + ... + 41333.

2⁶⁶¹²⁰⁸ is an apocalyptic number.

It is an amenable number.

661208 is a deficient number, since it is larger than the sum of its proper divisors (578572).

661208 is a wasteful number, since it uses less digits than its factorization.

661208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82657 (or 82653 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 661208 is about 813.1469731850. The cubic root of 661208 is about 87.1189635162.

The spelling of 661208 in words is "six hundred sixty-one thousand, two hundred eight".