268671861 has 24 divisors (see below), whose sum is σ = 394017624. Its totient is φ = 176394240.

The previous prime is 268671857. The next prime is 268671889. The reversal of 268671861 is 168176862.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 80460900 + 188210961 = 8970^2 + 13719^2 .

It is not a de Polignac number, because 268671861 - 2² = 268671857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268671841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209755 + ... + 211031.

It is an arithmetic number, because the mean of its divisors is an integer number (16417401).

Almost surely, 2^268671861 is an apocalyptic number.

It is an amenable number.

268671861 is a deficient number, since it is larger than the sum of its proper divisors (125345763).

268671861 is a wasteful number, since it uses less digits than its factorization.

268671861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621 (or 1618 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 268671861 is about 16391.2129203424. The cubic root of 268671861 is about 645.2688909525.

It can be divided in two parts, 2686 and 71861, that added together give a palindrome (74547).

The spelling of 268671861 in words is "two hundred sixty-eight million, six hundred seventy-one thousand, eight hundred sixty-one".