660996 has 72 divisors (see below), whose sum is σ = 1985984. Its totient is φ = 181440.

The previous prime is 660983. The next prime is 661009. The reversal of 660996 is 699066.

It is an interprime number because it is at equal distance from previous prime (660983) and next prime (661009).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 660996.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660996.

It is an unprimeable number.

660996 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 23 ways as a sum of consecutive naturals, for example, 10806 + ... + 10866.

2⁶⁶⁰⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (992992).

660996 is an abundant number, since it is smaller than the sum of its proper divisors (1324988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660996 is a wasteful number, since it uses less digits than its factorization.

660996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 660996 is about 813.0166049965. The cubic root of 660996 is about 87.1096516735.

The spelling of 660996 in words is "six hundred sixty thousand, nine hundred ninety-six".