659968 has 20 divisors (see below), whose sum is σ = 1319670. Its totient is φ = 329728.

The previous prime is 659963. The next prime is 659983. The reversal of 659968 is 869956.

It can be written as a sum of positive squares in only one way, i.e., 473344 + 186624 = 688^2 + 432^2 .

It is a super-2 number, since 2×659968² = 871115522048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (659963) by changing a digit.

659968 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133 + ... + 1156.

2⁶⁵⁹⁹⁶⁸ is an apocalyptic number.

It is an amenable number.

659968 is a deficient number, since it is larger than the sum of its proper divisors (659702).

659968 is an equidigital number, since it uses as much as digits as its factorization.

659968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307 (or 1291 counting only the distinct ones).

The product of its digits is 116640, while the sum is 43.

The square root of 659968 is about 812.3841455863. The cubic root of 659968 is about 87.0644697637.

The spelling of 659968 in words is "six hundred fifty-nine thousand, nine hundred sixty-eight".