428731507 has 2 divisors, whose sum is σ = 428731508. Its totient is φ = 428731506.

The previous prime is 428731487. The next prime is 428731531. The reversal of 428731507 is 705137824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428731507 - 2²³ = 420342899 is a prime.

It is not a weakly prime, because it can be changed into another prime (428731207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214365753 + 214365754.

It is an arithmetic number, because the mean of its divisors is an integer number (214365754).

Almost surely, 2^428731507 is an apocalyptic number.

428731507 is a deficient number, since it is larger than the sum of its proper divisors (1).

428731507 is an equidigital number, since it uses as much as digits as its factorization.

428731507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 428731507 is about 20705.8326806724. The cubic root of 428731507 is about 754.0413000054.

The spelling of 428731507 in words is "four hundred twenty-eight million, seven hundred thirty-one thousand, five hundred seven".