1628434057 has 2 divisors, whose sum is σ = 1628434058. Its totient is φ = 1628434056.

The previous prime is 1628434039. The next prime is 1628434079. The reversal of 1628434057 is 7504348261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 827770441 + 800663616 = 28771^2 + 28296^2 .

It is a cyclic number.

It is not a de Polignac number, because 1628434057 - 2¹¹ = 1628432009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1628434657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 814217028 + 814217029.

It is an arithmetic number, because the mean of its divisors is an integer number (814217029).

Almost surely, 2^1628434057 is an apocalyptic number.

It is an amenable number.

1628434057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1628434057 is an equidigital number, since it uses as much as digits as its factorization.

1628434057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 1628434057 is about 40353.8604968595. The cubic root of 1628434057 is about 1176.4949270475.

The spelling of 1628434057 in words is "one billion, six hundred twenty-eight million, four hundred thirty-four thousand, fifty-seven".