13280640 has 64 divisors (see below), whose sum is σ = 42338160. Its totient is φ = 3540992.

The previous prime is 13280599. The next prime is 13280647. The reversal of 13280640 is 4608231.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 13280640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13280647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1539 + ... + 5378.

Almost surely, 2^13280640 is an apocalyptic number.

13280640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13280640 is an abundant number, since it is smaller than the sum of its proper divisors (29057520).

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

13280640 is an equidigital number, since it uses as much as digits as its factorization.

13280640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6939 (or 6927 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 13280640 is about 3644.2612420078. The cubic root of 13280640 is about 236.8134336182.

Adding to 13280640 its reverse (4608231), we get a palindrome (17888871).

It can be divided in two parts, 1 and 3280640, that added together give a triangular number (3280641 = T₂₅₆₁).

The spelling of 13280640 in words is "thirteen million, two hundred eighty thousand, six hundred forty".