428385257 has 2 divisors, whose sum is σ = 428385258. Its totient is φ = 428385256.

The previous prime is 428385239. The next prime is 428385263. The reversal of 428385257 is 752583824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 325585936 + 102799321 = 18044^2 + 10139^2 .

It is a cyclic number.

It is not a de Polignac number, because 428385257 - 2²⁰ = 427336681 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (428385757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214192628 + 214192629.

It is an arithmetic number, because the mean of its divisors is an integer number (214192629).

Almost surely, 2^428385257 is an apocalyptic number.

It is an amenable number.

428385257 is a deficient number, since it is larger than the sum of its proper divisors (1).

428385257 is an equidigital number, since it uses as much as digits as its factorization.

428385257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 537600, while the sum is 44.

The square root of 428385257 is about 20697.4698212124. The cubic root of 428385257 is about 753.8382536440.

The spelling of 428385257 in words is "four hundred twenty-eight million, three hundred eighty-five thousand, two hundred fifty-seven".