660140 has 24 divisors (see below), whose sum is σ = 1493520. Its totient is φ = 243648.

The previous prime is 660137. The next prime is 660157. The reversal of 660140 is 41066.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660140.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010 + ... + 1529.

It is an arithmetic number, because the mean of its divisors is an integer number (62230).

2⁶⁶⁰¹⁴⁰ is an apocalyptic number.

It is an amenable number.

660140 is an abundant number, since it is smaller than the sum of its proper divisors (833380).

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

660140 is a wasteful number, since it uses less digits than its factorization.

660140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561 (or 2559 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 660140 is about 812.4899999385. The cubic root of 660140 is about 87.0720326496.

The spelling of 660140 in words is "six hundred sixty thousand, one hundred forty".