268508657 has 4 divisors (see below), whose sum is σ = 268864116. Its totient is φ = 268153200.

The previous prime is 268508623. The next prime is 268508677. The reversal of 268508657 is 756805862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 232135696 + 36372961 = 15236^2 + 6031^2 .

It is a cyclic number.

It is not a de Polignac number, because 268508657 - 2¹⁰ = 268507633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268508677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176594 + ... + 178107.

It is an arithmetic number, because the mean of its divisors is an integer number (67216029).

Almost surely, 2^268508657 is an apocalyptic number.

It is an amenable number.

268508657 is a deficient number, since it is larger than the sum of its proper divisors (355459).

268508657 is an equidigital number, since it uses as much as digits as its factorization.

268508657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355458.

The product of its (nonzero) digits is 806400, while the sum is 47.

The square root of 268508657 is about 16386.2337649626. The cubic root of 268508657 is about 645.1382088701.

The spelling of 268508657 in words is "two hundred sixty-eight million, five hundred eight thousand, six hundred fifty-seven".