428212657 has 2 divisors, whose sum is σ = 428212658. Its totient is φ = 428212656.

The previous prime is 428212649. The next prime is 428212663. The reversal of 428212657 is 756212824.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 419266576 + 8946081 = 20476^2 + 2991^2 .

It is a cyclic number.

It is not a de Polignac number, because 428212657 - 2³ = 428212649 is a prime.

It is a super-2 number, since 2×428212657² = 366732159229999298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (428212667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214106328 + 214106329.

It is an arithmetic number, because the mean of its divisors is an integer number (214106329).

Almost surely, 2^428212657 is an apocalyptic number.

It is an amenable number.

428212657 is a deficient number, since it is larger than the sum of its proper divisors (1).

428212657 is an equidigital number, since it uses as much as digits as its factorization.

428212657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 37.

The square root of 428212657 is about 20693.2998093586. The cubic root of 428212657 is about 753.7369974664.

The spelling of 428212657 in words is "four hundred twenty-eight million, two hundred twelve thousand, six hundred fifty-seven".