28457294869 has 2 divisors, whose sum is σ = 28457294870. Its totient is φ = 28457294868.

The previous prime is 28457294867. The next prime is 28457294881. The reversal of 28457294869 is 96849275482.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26916339844 + 1540955025 = 164062^2 + 39255^2 .

It is a cyclic number.

It is not a de Polignac number, because 28457294869 - 2¹ = 28457294867 is a prime.

It is a super-2 number, since 2×28457294869² (a number of 22 digits) contains 22 as substring.

Together with 28457294867, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28457294869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28457294863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14228647434 + 14228647435.

It is an arithmetic number, because the mean of its divisors is an integer number (14228647435).

Almost surely, 2^28457294869 is an apocalyptic number.

It is an amenable number.

28457294869 is a deficient number, since it is larger than the sum of its proper divisors (1).

28457294869 is an equidigital number, since it uses as much as digits as its factorization.

28457294869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69672960, while the sum is 64.

The spelling of 28457294869 in words is "twenty-eight billion, four hundred fifty-seven million, two hundred ninety-four thousand, eight hundred sixty-nine".