660800 has 84 divisors (see below), whose sum is σ = 1889760. Its totient is φ = 222720.

The previous prime is 660799. The next prime is 660809. The reversal of 660800 is 8066.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660809) 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, 11171 + ... + 11229.

2⁶⁶⁰⁸⁰⁰ 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 660800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (944880).

660800 is an abundant number, since it is smaller than the sum of its proper divisors (1228960).

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

660800 is a wasteful number, since it uses less digits than its factorization.

660800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 660800 is about 812.8960573161. The cubic root of 660800 is about 87.1010408400.

Adding to 660800 its reverse (8066), we get a palindrome (668866).

It can be divided in two parts, 6 and 60800, that added together give a palindrome (60806).

The spelling of 660800 in words is "six hundred sixty thousand, eight hundred".