428847791 has 2 divisors, whose sum is σ = 428847792. Its totient is φ = 428847790.

The previous prime is 428847779. The next prime is 428847821. The reversal of 428847791 is 197748824.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428847791 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428847721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214423895 + 214423896.

It is an arithmetic number, because the mean of its divisors is an integer number (214423896).

Almost surely, 2^428847791 is an apocalyptic number.

428847791 is a deficient number, since it is larger than the sum of its proper divisors (1).

428847791 is an equidigital number, since it uses as much as digits as its factorization.

428847791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 50.

The square root of 428847791 is about 20708.6404913505. The cubic root of 428847791 is about 754.1094662205.

The spelling of 428847791 in words is "four hundred twenty-eight million, eight hundred forty-seven thousand, seven hundred ninety-one".