57428869 has 2 divisors, whose sum is σ = 57428870. Its totient is φ = 57428868.

The previous prime is 57428867. The next prime is 57428897. The reversal of 57428869 is 96882475.

57428869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57183844 + 245025 = 7562^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 57428869 - 2¹ = 57428867 is a prime.

It is a super-2 number, since 2×57428869² = 6596149989238322, which contains 22 as substring.

Together with 57428867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57428867) 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, 28714434 + 28714435.

It is an arithmetic number, because the mean of its divisors is an integer number (28714435).

Almost surely, 2^57428869 is an apocalyptic number.

It is an amenable number.

57428869 is a deficient number, since it is larger than the sum of its proper divisors (1).

57428869 is an equidigital number, since it uses as much as digits as its factorization.

57428869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 49.

The square root of 57428869 is about 7578.1837533805. The cubic root of 57428869 is about 385.8129087871.

The spelling of 57428869 in words is "fifty-seven million, four hundred twenty-eight thousand, eight hundred sixty-nine".