660992 has 20 divisors (see below), whose sum is σ = 1321716. Its totient is φ = 330240.

The previous prime is 660983. The next prime is 661009. The reversal of 660992 is 299066.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

660992 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134 + ... + 1157.

2⁶⁶⁰⁹⁹² is an apocalyptic number.

It is an amenable number.

660992 is a deficient number, since it is larger than the sum of its proper divisors (660724).

660992 is an equidigital number, since it uses as much as digits as its factorization.

660992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309 (or 1293 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 660992 is about 813.0141450184. The cubic root of 660992 is about 87.1094759592.

The spelling of 660992 in words is "six hundred sixty thousand, nine hundred ninety-two".