660897 has 6 divisors (see below), whose sum is σ = 954642. Its totient is φ = 440592.

The previous prime is 660893. The next prime is 660899. The reversal of 660897 is 798066.

It can be written as a sum of positive squares in only one way, i.e., 463761 + 197136 = 681^2 + 444^2 .

It is not a de Polignac number, because 660897 - 2² = 660893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660893) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36708 + ... + 36725.

It is an arithmetic number, because the mean of its divisors is an integer number (159107).

2⁶⁶⁰⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

660897 is a deficient number, since it is larger than the sum of its proper divisors (293745).

660897 is a wasteful number, since it uses less digits than its factorization.

660897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73439 (or 73436 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 660897 is about 812.9557183513. The cubic root of 660897 is about 87.1053025367.

The spelling of 660897 in words is "six hundred sixty thousand, eight hundred ninety-seven".