428728843 has 2 divisors, whose sum is σ = 428728844. Its totient is φ = 428728842.

The previous prime is 428728793. The next prime is 428728847. The reversal of 428728843 is 348827824.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428728843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 428728793 and 428728802.

It is not a weakly prime, because it can be changed into another prime (428728847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214364421 + 214364422.

It is an arithmetic number, because the mean of its divisors is an integer number (214364422).

Almost surely, 2^428728843 is an apocalyptic number.

428728843 is a deficient number, since it is larger than the sum of its proper divisors (1).

428728843 is an equidigital number, since it uses as much as digits as its factorization.

428728843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 688128, while the sum is 46.

The square root of 428728843 is about 20705.7683508727. The cubic root of 428728843 is about 754.0397382120.

It can be divided in two parts, 42872 and 8843, that added together give a palindrome (51715).

The spelling of 428728843 in words is "four hundred twenty-eight million, seven hundred twenty-eight thousand, eight hundred forty-three".