12780624 has 40 divisors (see below), whose sum is σ = 33256800. Its totient is φ = 4229248.

The previous prime is 12780613. The next prime is 12780629. The reversal of 12780624 is 42608721.

It is a Cunningham number, because it is equal to 3575²-1.

It is a junction number, because it is equal to n+sod(n) for n = 12780591 and 12780600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12780629) 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, 6259 + ... + 8045.

It is an arithmetic number, because the mean of its divisors is an integer number (831420).

Almost surely, 2^12780624 is an apocalyptic number.

It is an amenable number.

12780624 is an abundant number, since it is smaller than the sum of its proper divisors (20476176).

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

12780624 is a wasteful number, since it uses less digits than its factorization.

12780624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947 (or 1941 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 12780624 is about 3574.9998601399. Note that the first 3 decimals coincide. The cubic root of 12780624 is about 233.8033266001.

The spelling of 12780624 in words is "twelve million, seven hundred eighty thousand, six hundred twenty-four".