660869 has 8 divisors (see below), whose sum is σ = 731712. Its totient is φ = 591840.

The previous prime is 660853. The next prime is 660887. The reversal of 660869 is 968066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660869 - 2⁴ = 660853 is a prime.

It is a super-2 number, since 2×660869² = 873495670322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392 + ... + 1214.

It is an arithmetic number, because the mean of its divisors is an integer number (91464).

2⁶⁶⁰⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

660869 is a deficient number, since it is larger than the sum of its proper divisors (70843).

660869 is a wasteful number, since it uses less digits than its factorization.

660869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 660869 is about 812.9384970587. The cubic root of 660869 is about 87.1040723990.

The spelling of 660869 in words is "six hundred sixty thousand, eight hundred sixty-nine".