266242990 has 32 divisors (see below), whose sum is σ = 516823776. Its totient is φ = 98167680.

The previous prime is 266242961. The next prime is 266242993. The reversal of 266242990 is 99242662.

It is a happy number.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266242993) 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 15 ways as a sum of consecutive naturals, for example, 178789 + ... + 180271.

It is an arithmetic number, because the mean of its divisors is an integer number (16150743).

Almost surely, 2^266242990 is an apocalyptic number.

266242990 is a deficient number, since it is larger than the sum of its proper divisors (250580786).

266242990 is a wasteful number, since it uses less digits than its factorization.

266242990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2884.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 266242990 is about 16316.9540662466. The cubic root of 266242990 is about 643.3185296124.

The spelling of 266242990 in words is "two hundred sixty-six million, two hundred forty-two thousand, nine hundred ninety".