266743680 has 256 divisors, whose sum is σ = 987033600. Its totient is φ = 60014592.

The previous prime is 266743669. The next prime is 266743691. The reversal of 266743680 is 86347662.

It is an interprime number because it is at equal distance from previous prime (266743669) and next prime (266743691).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1196049 + ... + 1196271.

It is an arithmetic number, because the mean of its divisors is an integer number (3855600).

Almost surely, 2^266743680 is an apocalyptic number.

266743680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266743680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (493516800).

266743680 is an abundant number, since it is smaller than the sum of its proper divisors (720289920).

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

266743680 is a wasteful number, since it uses less digits than its factorization.

266743680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 42.

The square root of 266743680 is about 16332.2894904542. The cubic root of 266743680 is about 643.7215467362.

The spelling of 266743680 in words is "two hundred sixty-six million, seven hundred forty-three thousand, six hundred eighty".