266658740 has 24 divisors (see below), whose sum is σ = 563227560. Its totient is φ = 106045568.

The previous prime is 266658739. The next prime is 266658751. The reversal of 266658740 is 47856662.

It can be written as a sum of positive squares in 4 ways, for example, as 141800464 + 124858276 = 11908^2 + 11174^2 .

It is a super-2 number, since 2×266658740² = 142213767236775200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 266658691 and 266658700.

It is a congruent number.

It is an unprimeable number.

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, 35075 + ... + 41994.

It is an arithmetic number, because the mean of its divisors is an integer number (23467815).

Almost surely, 2^266658740 is an apocalyptic number.

266658740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266658740 is an abundant number, since it is smaller than the sum of its proper divisors (296568820).

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

266658740 is a wasteful number, since it uses less digits than its factorization.

266658740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77251 (or 77249 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 266658740 is about 16329.6889131422. The cubic root of 266658740 is about 643.6532120801.

The spelling of 266658740 in words is "two hundred sixty-six million, six hundred fifty-eight thousand, seven hundred forty".