660735 has 12 divisors (see below), whose sum is σ = 1145352. Its totient is φ = 352368.

The previous prime is 660733. The next prime is 660757. The reversal of 660735 is 537066.

It is not a de Polignac number, because 660735 - 2¹ = 660733 is a prime.

660735 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 660699 and 660708.

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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7297 + ... + 7386.

It is an arithmetic number, because the mean of its divisors is an integer number (95446).

2⁶⁶⁰⁷³⁵ is an apocalyptic number.

660735 is a deficient number, since it is larger than the sum of its proper divisors (484617).

660735 is a wasteful number, since it uses less digits than its factorization.

660735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14694 (or 14691 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 660735 is about 812.8560758215. The cubic root of 660735 is about 87.0981848305.

The spelling of 660735 in words is "six hundred sixty thousand, seven hundred thirty-five".