266457680 has 20 divisors (see below), whose sum is σ = 619514292. Its totient is φ = 106583040.

The previous prime is 266457673. The next prime is 266457689. The reversal of 266457680 is 86754662.

266457680 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 33223696 + 233233984 = 5764^2 + 15272^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266457689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1665281 + ... + 1665440.

Almost surely, 2^266457680 is an apocalyptic number.

266457680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266457680 is an abundant number, since it is smaller than the sum of its proper divisors (353056612).

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

266457680 is a wasteful number, since it uses less digits than its factorization.

266457680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330734 (or 3330728 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 266457680 is about 16323.5314806570. The cubic root of 266457680 is about 643.4914004526.

The spelling of 266457680 in words is "two hundred sixty-six million, four hundred fifty-seven thousand, six hundred eighty".