28457047 has 2 divisors, whose sum is σ = 28457048. Its totient is φ = 28457046.

The previous prime is 28456979. The next prime is 28457071. The reversal of 28457047 is 74075482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28457047 - 2¹¹ = 28454999 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28456997 and 28457015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28457347) 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, 14228523 + 14228524.

It is an arithmetic number, because the mean of its divisors is an integer number (14228524).

Almost surely, 2^28457047 is an apocalyptic number.

28457047 is a deficient number, since it is larger than the sum of its proper divisors (1).

28457047 is an equidigital number, since it uses as much as digits as its factorization.

28457047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62720, while the sum is 37.

The square root of 28457047 is about 5334.5146920784. The cubic root of 28457047 is about 305.3022069563.

The spelling of 28457047 in words is "twenty-eight million, four hundred fifty-seven thousand, forty-seven".