266709840 has 160 divisors (see below), whose sum is σ = 908513280. Its totient is φ = 64424448.

The previous prime is 266709827. The next prime is 266709847. The reversal of 266709840 is 48907662.

It is a super-2 number, since 2×266709840² = 142268277505651200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 266709792 and 266709801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266709847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103609 + ... + 106151.

It is an arithmetic number, because the mean of its divisors is an integer number (5678208).

Almost surely, 2^266709840 is an apocalyptic number.

266709840 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 266709840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (454256640).

266709840 is an abundant number, since it is smaller than the sum of its proper divisors (641803440).

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

266709840 is a wasteful number, since it uses less digits than its factorization.

266709840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2601 (or 2595 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 266709840 is about 16331.2534730191. The cubic root of 266709840 is about 643.6943240252.

The spelling of 266709840 in words is "two hundred sixty-six million, seven hundred nine thousand, eight hundred forty".