266940560 has 80 divisors (see below), whose sum is σ = 644375424. Its totient is φ = 102767616.

The previous prime is 266940559. The next prime is 266940581. The reversal of 266940560 is 65049662.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×266940560² = 142514525146227200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250589 + ... + 251651.

Almost surely, 2^266940560 is an apocalyptic number.

266940560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266940560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322187712).

266940560 is an abundant number, since it is smaller than the sum of its proper divisors (377434864).

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

266940560 is a wasteful number, since it uses less digits than its factorization.

266940560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192 (or 1186 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 266940560 is about 16338.3157026665. The cubic root of 266940560 is about 643.8798819218.

The spelling of 266940560 in words is "two hundred sixty-six million, nine hundred forty thousand, five hundred sixty".