660888 has 48 divisors (see below), whose sum is σ = 1829880. Its totient is φ = 215424.

The previous prime is 660887. The next prime is 660893. The reversal of 660888 is 888066.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4756 + ... + 4892.

2⁶⁶⁰⁸⁸⁸ 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 660888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (914940).

660888 is an abundant number, since it is smaller than the sum of its proper divisors (1168992).

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

660888 is a wasteful number, since it uses less digits than its factorization.

660888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 660888 is about 812.9501829756. The cubic root of 660888 is about 87.1049071391.

The spelling of 660888 in words is "six hundred sixty thousand, eight hundred eighty-eight".