28057730447 has 2 divisors, whose sum is σ = 28057730448. Its totient is φ = 28057730446.

The previous prime is 28057730419. The next prime is 28057730453. The reversal of 28057730447 is 74403775082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28057730447 - 2¹² = 28057726351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28057730417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028865223 + 14028865224.

It is an arithmetic number, because the mean of its divisors is an integer number (14028865224).

Almost surely, 2^28057730447 is an apocalyptic number.

28057730447 is a deficient number, since it is larger than the sum of its proper divisors (1).

28057730447 is an equidigital number, since it uses as much as digits as its factorization.

28057730447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1317120, while the sum is 47.

The spelling of 28057730447 in words is "twenty-eight billion, fifty-seven million, seven hundred thirty thousand, four hundred forty-seven".