266860728 has 24 divisors (see below), whose sum is σ = 722748000. Its totient is φ = 88953552.

The previous prime is 266860721. The next prime is 266860729. The reversal of 266860728 is 827068662.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266860721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1853128 + ... + 1853271.

It is an arithmetic number, because the mean of its divisors is an integer number (30114500).

Almost surely, 2^266860728 is an apocalyptic number.

It is an amenable number.

266860728 is an abundant number, since it is smaller than the sum of its proper divisors (455887272).

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

266860728 is a wasteful number, since it uses less digits than its factorization.

266860728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3706411 (or 3706404 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 266860728 is about 16335.8724284931. The cubic root of 266860728 is about 643.8156886750.

The spelling of 266860728 in words is "two hundred sixty-six million, eight hundred sixty thousand, seven hundred twenty-eight".