660977 has 8 divisors (see below), whose sum is σ = 712800. Its totient is φ = 610624.

The previous prime is 660973. The next prime is 660983. The reversal of 660977 is 779066.

660977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 660977 - 2² = 660973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660973) 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, 674 + ... + 1332.

It is an arithmetic number, because the mean of its divisors is an integer number (89100).

2⁶⁶⁰⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

660977 is a deficient number, since it is larger than the sum of its proper divisors (51823).

660977 is a wasteful number, since it uses less digits than its factorization.

660977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 660977 is about 813.0049200343. The cubic root of 660977 is about 87.1088170244.

The spelling of 660977 in words is "six hundred sixty thousand, nine hundred seventy-seven".