428887772849 has 2 divisors, whose sum is σ = 428887772850. Its totient is φ = 428887772848.

The previous prime is 428887772821. The next prime is 428887772851. The reversal of 428887772849 is 948277788824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 373565440000 + 55322332849 = 611200^2 + 235207^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428887772849 is a prime.

Together with 428887772851, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (428887772899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214443886424 + 214443886425.

It is an arithmetic number, because the mean of its divisors is an integer number (214443886425).

Almost surely, 2^428887772849 is an apocalyptic number.

It is an amenable number.

428887772849 is a deficient number, since it is larger than the sum of its proper divisors (1).

428887772849 is an equidigital number, since it uses as much as digits as its factorization.

428887772849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 809238528, while the sum is 74.

The spelling of 428887772849 in words is "four hundred twenty-eight billion, eight hundred eighty-seven million, seven hundred seventy-two thousand, eight hundred forty-nine".