55720393 has 2 divisors, whose sum is σ = 55720394. Its totient is φ = 55720392.

The previous prime is 55720381. The next prime is 55720403. The reversal of 55720393 is 39302755.

55720393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28815424 + 26904969 = 5368^2 + 5187^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55720393 is a prime.

It is not a weakly prime, because it can be changed into another prime (55720363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27860196 + 27860197.

It is an arithmetic number, because the mean of its divisors is an integer number (27860197).

Almost surely, 2^55720393 is an apocalyptic number.

It is an amenable number.

55720393 is a deficient number, since it is larger than the sum of its proper divisors (1).

55720393 is an equidigital number, since it uses as much as digits as its factorization.

55720393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28350, while the sum is 34.

The square root of 55720393 is about 7464.6093668725. The cubic root of 55720393 is about 381.9484250976.

The spelling of 55720393 in words is "fifty-five million, seven hundred twenty thousand, three hundred ninety-three".