266872638 has 16 divisors (see below), whose sum is σ = 548171280. Its totient is φ = 86553216.

The previous prime is 266872637. The next prime is 266872687. The reversal of 266872638 is 836278662.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266872637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 600843 + ... + 601286.

It is an arithmetic number, because the mean of its divisors is an integer number (34260705).

Almost surely, 2^266872638 is an apocalyptic number.

266872638 is an abundant number, since it is smaller than the sum of its proper divisors (281298642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266872638 is a wasteful number, since it uses less digits than its factorization.

266872638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202171.

The product of its digits is 1161216, while the sum is 48.

The square root of 266872638 is about 16336.2369595938. The cubic root of 266872638 is about 643.8252663685.

The spelling of 266872638 in words is "two hundred sixty-six million, eight hundred seventy-two thousand, six hundred thirty-eight".