660787 has 2 divisors, whose sum is σ = 660788. Its totient is φ = 660786.

The previous prime is 660769. The next prime is 660791. The reversal of 660787 is 787066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660787 - 2⁷ = 660659 is a prime.

It is not a weakly prime, because it can be changed into another prime (660727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330393 + 330394.

It is an arithmetic number, because the mean of its divisors is an integer number (330394).

2⁶⁶⁰⁷⁸⁷ is an apocalyptic number.

660787 is a deficient number, since it is larger than the sum of its proper divisors (1).

660787 is an equidigital number, since it uses as much as digits as its factorization.

660787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 660787 is about 812.8880611745. Note that the first 3 decimals coincide. The cubic root of 660787 is about 87.1004696531.

The spelling of 660787 in words is "six hundred sixty thousand, seven hundred eighty-seven".