268517138 has 6 divisors (see below), whose sum is σ = 402810471. Its totient is φ = 134246982.

The previous prime is 268517131. The next prime is 268517149. The reversal of 268517138 is 831715862.

It can be written as a sum of positive squares in only one way, i.e., 134258569 + 134258569 = 11587^2 + 11587^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=11587.

It is a super-2 number, since 2×268517138² = 144202906799422088, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 268517095 and 268517104.

It is not an unprimeable number, because it can be changed into a prime (268517131) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17381 + ... + 28967.

Almost surely, 2^268517138 is an apocalyptic number.

268517138 is a deficient number, since it is larger than the sum of its proper divisors (134293333).

268517138 is an frugal number, since it uses more digits than its factorization.

268517138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23176 (or 11589 counting only the distinct ones).

The product of its digits is 80640, while the sum is 41.

The square root of 268517138 is about 16386.4925472171. The cubic root of 268517138 is about 645.1450011521.

The spelling of 268517138 in words is "two hundred sixty-eight million, five hundred seventeen thousand, one hundred thirty-eight".