12780320 has 48 divisors (see below), whose sum is σ = 34509888. Its totient is φ = 4381440.

The previous prime is 12780307. The next prime is 12780323. The reversal of 12780320 is 2308721.

It is not an unprimeable number, because it can be changed into a prime (12780323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4586 + ... + 6825.

It is an arithmetic number, because the mean of its divisors is an integer number (718956).

Almost surely, 2^12780320 is an apocalyptic number.

12780320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12780320 is an abundant number, since it is smaller than the sum of its proper divisors (21729568).

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

12780320 is a wasteful number, since it uses less digits than its factorization.

12780320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11433 (or 11425 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 12780320 is about 3574.9573424028. The cubic root of 12780320 is about 233.8014728363.

The spelling of 12780320 in words is "twelve million, seven hundred eighty thousand, three hundred twenty".