57768209 has 4 divisors (see below), whose sum is σ = 58417380. Its totient is φ = 57119040.

The previous prime is 57768187. The next prime is 57768229. The reversal of 57768209 is 90286775.

57768209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3598609 + 54169600 = 1897^2 + 7360^2 .

It is a cyclic number.

It is not a de Polignac number, because 57768209 - 2⁸ = 57767953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 57768209.

It is not an unprimeable number, because it can be changed into a prime (57768229) 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 in 3 ways as a sum of consecutive naturals, for example, 324452 + ... + 324629.

It is an arithmetic number, because the mean of its divisors is an integer number (14604345).

Almost surely, 2^57768209 is an apocalyptic number.

It is an amenable number.

57768209 is a deficient number, since it is larger than the sum of its proper divisors (649171).

57768209 is an equidigital number, since it uses as much as digits as its factorization.

57768209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649170.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 57768209 is about 7600.5400466020. The cubic root of 57768209 is about 386.5713236818.

It can be divided in two parts, 577 and 68209, that added together give a palindrome (68786).

The spelling of 57768209 in words is "fifty-seven million, seven hundred sixty-eight thousand, two hundred nine".