660730 has 16 divisors (see below), whose sum is σ = 1359360. Its totient is φ = 226512.

The previous prime is 660727. The next prime is 660731. The reversal of 660730 is 37066.

660730 = 74² + 75² + ... + 133².

It is a happy number.

660730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (660731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4650 + ... + 4789.

It is an arithmetic number, because the mean of its divisors is an integer number (84960).

2⁶⁶⁰⁷³⁰ is an apocalyptic number.

660730 is an abundant number, since it is smaller than the sum of its proper divisors (698630).

It is a weird number, because it is abundant, but not a pseudoperfect number.

660730 is a wasteful number, since it uses less digits than its factorization.

660730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9453.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 660730 is about 812.8530002405. The cubic root of 660730 is about 87.0979651297.

Adding to 660730 its reverse (37066), we get a palindrome (697796).

The spelling of 660730 in words is "six hundred sixty thousand, seven hundred thirty".