428315257 has 2 divisors, whose sum is σ = 428315258. Its totient is φ = 428315256.

The previous prime is 428315249. The next prime is 428315267. The reversal of 428315257 is 752513824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 407192041 + 21123216 = 20179^2 + 4596^2 .

It is a cyclic number.

It is not a de Polignac number, because 428315257 - 2³ = 428315249 is a prime.

It is not a weakly prime, because it can be changed into another prime (428315227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214157628 + 214157629.

It is an arithmetic number, because the mean of its divisors is an integer number (214157629).

Almost surely, 2^428315257 is an apocalyptic number.

It is an amenable number.

428315257 is a deficient number, since it is larger than the sum of its proper divisors (1).

428315257 is an equidigital number, since it uses as much as digits as its factorization.

428315257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67200, while the sum is 37.

The square root of 428315257 is about 20695.7787241746. The cubic root of 428315257 is about 753.7971912659.

The spelling of 428315257 in words is "four hundred twenty-eight million, three hundred fifteen thousand, two hundred fifty-seven".