56809729 has 2 divisors, whose sum is σ = 56809730. Its totient is φ = 56809728.

The previous prime is 56809721. The next prime is 56809757. The reversal of 56809729 is 92790865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55950400 + 859329 = 7480^2 + 927^2 .

It is a cyclic number.

It is not a de Polignac number, because 56809729 - 2³ = 56809721 is a prime.

It is not a weakly prime, because it can be changed into another prime (56809721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28404864 + 28404865.

It is an arithmetic number, because the mean of its divisors is an integer number (28404865).

Almost surely, 2^56809729 is an apocalyptic number.

It is an amenable number.

56809729 is a deficient number, since it is larger than the sum of its proper divisors (1).

56809729 is an equidigital number, since it uses as much as digits as its factorization.

56809729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 56809729 is about 7537.2228970623. Note that the first 3 decimals coincide. The cubic root of 56809729 is about 384.4214146167.

The spelling of 56809729 in words is "fifty-six million, eight hundred nine thousand, seven hundred twenty-nine".