515668 has 12 divisors (see below), whose sum is σ = 909972. Its totient is φ = 255680.

The previous prime is 515663. The next prime is 515677. The reversal of 515668 is 866515.

It can be written as a sum of positive squares in 2 ways, for example, as 311364 + 204304 = 558^2 + 452^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515663) by changing a digit.

515668 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 in 3 ways as a sum of consecutive naturals, for example, 78 + ... + 1018.

It is an arithmetic number, because the mean of its divisors is an integer number (75831).

2⁵¹⁵⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

515668 is a deficient number, since it is larger than the sum of its proper divisors (394304).

515668 is a wasteful number, since it uses less digits than its factorization.

515668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082 (or 1080 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 515668 is about 718.1002715499. The cubic root of 515668 is about 80.1905872623.

The spelling of 515668 in words is "five hundred fifteen thousand, six hundred sixty-eight".