660740 has 12 divisors (see below), whose sum is σ = 1387596. Its totient is φ = 264288.

The previous prime is 660733. The next prime is 660757. The reversal of 660740 is 47066.

It can be written as a sum of positive squares in 2 ways, for example, as 73984 + 586756 = 272^2 + 766^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

660740 is a modest number, since divided by 740 gives 660 as remainder.

It is an unprimeable number.

660740 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16499 + ... + 16538.

It is an arithmetic number, because the mean of its divisors is an integer number (115633).

2⁶⁶⁰⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

660740 is an abundant number, since it is smaller than the sum of its proper divisors (726856).

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

660740 is a wasteful number, since it uses less digits than its factorization.

660740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33046 (or 33044 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 660740 is about 812.8591513909. The cubic root of 660740 is about 87.0984045302.

The spelling of 660740 in words is "six hundred sixty thousand, seven hundred forty".