660736 has 36 divisors (see below), whose sum is σ = 1379700. Its totient is φ = 315392.

The previous prime is 660733. The next prime is 660757. The reversal of 660736 is 637066.

It can be written as a sum of positive squares in 2 ways, for example, as 230400 + 430336 = 480^2 + 656^2 .

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7380 + ... + 7468.

It is an arithmetic number, because the mean of its divisors is an integer number (38325).

2⁶⁶⁰⁷³⁶ 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 660736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (689850).

660736 is an abundant number, since it is smaller than the sum of its proper divisors (718964).

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

660736 is an equidigital number, since it uses as much as digits as its factorization.

660736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 660736 is about 812.8566909364. The cubic root of 660736 is about 87.0982287705.

The spelling of 660736 in words is "six hundred sixty thousand, seven hundred thirty-six".