268519805 has 4 divisors (see below), whose sum is σ = 322223772. Its totient is φ = 214815840.

The previous prime is 268519793. The next prime is 268519807. The reversal of 268519805 is 508915862.

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 47045881 + 221473924 = 6859^2 + 14882^2 .

It is not a de Polignac number, because 268519805 - 2¹⁶ = 268454269 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 (268519807) 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, 26851976 + ... + 26851985.

It is an arithmetic number, because the mean of its divisors is an integer number (80555943).

Almost surely, 2^268519805 is an apocalyptic number.

It is an amenable number.

268519805 is a deficient number, since it is larger than the sum of its proper divisors (53703967).

268519805 is an equidigital number, since it uses as much as digits as its factorization.

268519805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53703966.

The product of its (nonzero) digits is 172800, while the sum is 44.

The square root of 268519805 is about 16386.5739250156. The cubic root of 268519805 is about 645.1471370754.

The spelling of 268519805 in words is "two hundred sixty-eight million, five hundred nineteen thousand, eight hundred five".