266400028728 has 24 divisors (see below), whose sum is σ = 721500078000. Its totient is φ = 88800009552.

The previous prime is 266400028721. The next prime is 266400028813. The reversal of 266400028728 is 827820004662.

266400028728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (266400028721) 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, 1850000128 + ... + 1850000271.

It is an arithmetic number, because the mean of its divisors is an integer number (30062503250).

Almost surely, 2^266400028728 is an apocalyptic number.

It is an amenable number.

266400028728 is an abundant number, since it is smaller than the sum of its proper divisors (455100049272).

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

266400028728 is a wasteful number, since it uses less digits than its factorization.

266400028728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3700000411 (or 3700000404 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The spelling of 266400028728 in words is "two hundred sixty-six billion, four hundred million, twenty-eight thousand, seven hundred twenty-eight".