12751720 has 16 divisors (see below), whose sum is σ = 28691460. Its totient is φ = 5100672.

The previous prime is 12751691. The next prime is 12751727. The reversal of 12751720 is 2715721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12292036 + 459684 = 3506^2 + 678^2 .

It is not an unprimeable number, because it can be changed into a prime (12751727) 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, 159357 + ... + 159436.

Almost surely, 2^12751720 is an apocalyptic number.

12751720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12751720 is an abundant number, since it is smaller than the sum of its proper divisors (15939740).

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

12751720 is a wasteful number, since it uses less digits than its factorization.

12751720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318804 (or 318800 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 12751720 is about 3570.9550543237. The cubic root of 12751720 is about 233.6269410505.

The spelling of 12751720 in words is "twelve million, seven hundred fifty-one thousand, seven hundred twenty".