266320764 has 24 divisors (see below), whose sum is σ = 690461520. Its totient is φ = 88773552.

The previous prime is 266320741. The next prime is 266320799. The reversal of 266320764 is 467023662.

It is a happy number.

266320764 is a `hidden beast` number, since 266 + 320 + 76 + 4 = 666.

It is a super-3 number, since 3×266320764³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1232859 + ... + 1233074.

It is an arithmetic number, because the mean of its divisors is an integer number (28769230).

Almost surely, 2^266320764 is an apocalyptic number.

It is an amenable number.

266320764 is an abundant number, since it is smaller than the sum of its proper divisors (424140756).

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

266320764 is a wasteful number, since it uses less digits than its factorization.

266320764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465946 (or 2465938 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 266320764 is about 16319.3371188906. The cubic root of 266320764 is about 643.3811648568.

It can be divided in two parts, 26 and 6320764, that added together give a triangular number (6320790 = T₃₅₅₅).

The spelling of 266320764 in words is "two hundred sixty-six million, three hundred twenty thousand, seven hundred sixty-four".