266263890 has 16 divisors (see below), whose sum is σ = 639033408. Its totient is φ = 71003696.

The previous prime is 266263889. The next prime is 266263897. The reversal of 266263890 is 98362662.

It is not an unprimeable number, because it can be changed into a prime (266263897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4437702 + ... + 4437761.

It is an arithmetic number, because the mean of its divisors is an integer number (39939588).

Almost surely, 2^266263890 is an apocalyptic number.

266263890 is an abundant number, since it is smaller than the sum of its proper divisors (372769518).

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

266263890 is a wasteful number, since it uses less digits than its factorization.

266263890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8875473.

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 266263890 is about 16317.5944918361. The cubic root of 266263890 is about 643.3353626133.

The spelling of 266263890 in words is "two hundred sixty-six million, two hundred sixty-three thousand, eight hundred ninety".