13266640 has 20 divisors (see below), whose sum is σ = 30845124. Its totient is φ = 5306624.

The previous prime is 13266623. The next prime is 13266641. The reversal of 13266640 is 4666231.

13266640 is digitally balanced in base 2, because in such base 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 2534464 + 10732176 = 1592^2 + 3276^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 13266599 and 13266608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13266641) 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, 82837 + ... + 82996.

Almost surely, 2^13266640 is an apocalyptic number.

13266640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13266640 is an abundant number, since it is smaller than the sum of its proper divisors (17578484).

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

13266640 is a wasteful number, since it uses less digits than its factorization.

13266640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165846 (or 165840 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 13266640 is about 3642.3399072574. The cubic root of 13266640 is about 236.7301907990.

The spelling of 13266640 in words is "thirteen million, two hundred sixty-six thousand, six hundred forty".