1628538427 has 2 divisors, whose sum is σ = 1628538428. Its totient is φ = 1628538426.

The previous prime is 1628538419. The next prime is 1628538463. The reversal of 1628538427 is 7248358261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1628538427 - 2³ = 1628538419 is a prime.

It is not a weakly prime, because it can be changed into another prime (1628538727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 814269213 + 814269214.

It is an arithmetic number, because the mean of its divisors is an integer number (814269214).

Almost surely, 2^1628538427 is an apocalyptic number.

1628538427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1628538427 is an equidigital number, since it uses as much as digits as its factorization.

1628538427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 46.

The square root of 1628538427 is about 40355.1536609638. The cubic root of 1628538427 is about 1176.5200612456.

The spelling of 1628538427 in words is "one billion, six hundred twenty-eight million, five hundred thirty-eight thousand, four hundred twenty-seven".