268605509 has 8 divisors (see below), whose sum is σ = 274597752. Its totient is φ = 262664640.

The previous prime is 268605503. The next prime is 268605529. The reversal of 268605509 is 905506862.

It can be written as a sum of positive squares in 4 ways, for example, as 27269284 + 241336225 = 5222^2 + 15535^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-268605509 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 (268605503) 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, 2174 + ... + 23279.

It is an arithmetic number, because the mean of its divisors is an integer number (34324719).

Almost surely, 2^268605509 is an apocalyptic number.

It is an amenable number.

268605509 is a deficient number, since it is larger than the sum of its proper divisors (5992243).

268605509 is a wasteful number, since it uses less digits than its factorization.

268605509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25687.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 268605509 is about 16389.1887840735. The cubic root of 268605509 is about 645.2157674057.

The spelling of 268605509 in words is "two hundred sixty-eight million, six hundred five thousand, five hundred nine".