266940648 has 96 divisors (see below), whose sum is σ = 793414440. Its totient is φ = 80570880.

The previous prime is 266940643. The next prime is 266940757. The reversal of 266940648 is 846049662.

It can be written as a sum of positive squares in 4 ways, for example, as 190937124 + 76003524 = 13818^2 + 8718^2 .

It is a super-3 number, since 3×266940648³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (266940643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46918 + ... + 52298.

Almost surely, 2^266940648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266940648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (396707220).

266940648 is an abundant number, since it is smaller than the sum of its proper divisors (526473792).

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

266940648 is a wasteful number, since it uses less digits than its factorization.

266940648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5459 (or 5452 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 266940648 is about 16338.3183957224. The cubic root of 266940648 is about 643.8799526759.

The spelling of 266940648 in words is "two hundred sixty-six million, nine hundred forty thousand, six hundred forty-eight".