660884 has 12 divisors (see below), whose sum is σ = 1321824. Its totient is φ = 283224.

The previous prime is 660853. The next prime is 660887. The reversal of 660884 is 488066.

660884 is an admirable number.

It is a super-2 number, since 2×660884² = 873535322912, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 660884.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660887) by changing a digit.

660884 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 3 ways as a sum of consecutive naturals, for example, 11774 + ... + 11829.

It is an arithmetic number, because the mean of its divisors is an integer number (110152).

2⁶⁶⁰⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

660884 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

660884 is a wasteful number, since it uses less digits than its factorization.

660884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23614 (or 23612 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 660884 is about 812.9477227965. The cubic root of 660884 is about 87.1047314057.

The spelling of 660884 in words is "six hundred sixty thousand, eight hundred eighty-four".