268881506 has 4 divisors (see below), whose sum is σ = 403322262. Its totient is φ = 134440752.

The previous prime is 268881463. The next prime is 268881539. The reversal of 268881506 is 605188862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605188862 = 2 ⋅302594431.

It can be written as a sum of positive squares in only one way, i.e., 237622225 + 31259281 = 15415^2 + 5591^2 .

It is a Curzon number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 67220375 + ... + 67220378.

Almost surely, 2^268881506 is an apocalyptic number.

268881506 is a deficient number, since it is larger than the sum of its proper divisors (134440756).

268881506 is a wasteful number, since it uses less digits than its factorization.

268881506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134440755.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 268881506 is about 16397.6067156155. The cubic root of 268881506 is about 645.4366820337.

The spelling of 268881506 in words is "two hundred sixty-eight million, eight hundred eighty-one thousand, five hundred six".