660879 has 20 divisors (see below), whose sum is σ = 1016400. Its totient is φ = 427680.

The previous prime is 660853. The next prime is 660887. The reversal of 660879 is 978066.

660879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 660879 - 2⁹ = 660367 is a prime.

It is a super-2 number, since 2×660879² = 873522105282, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an Ulam 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 19 ways as a sum of consecutive naturals, for example, 3222 + ... + 3420.

It is an arithmetic number, because the mean of its divisors is an integer number (50820).

2⁶⁶⁰⁸⁷⁹ is an apocalyptic number.

660879 is a deficient number, since it is larger than the sum of its proper divisors (355521).

660879 is a wasteful number, since it uses less digits than its factorization.

660879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 243 counting only the distinct ones).

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

The square root of 660879 is about 812.9446475622. The cubic root of 660879 is about 87.1045117379.

The spelling of 660879 in words is "six hundred sixty thousand, eight hundred seventy-nine".