1628538459 has 16 divisors (see below), whose sum is σ = 2194692864. Its totient is φ = 1074060000.

The previous prime is 1628538427. The next prime is 1628538463. The reversal of 1628538459 is 9548358261.

It is not a de Polignac number, because 1628538459 - 2⁵ = 1628538427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1628538419) 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 in 15 ways as a sum of consecutive naturals, for example, 399984 + ... + 404034.

It is an arithmetic number, because the mean of its divisors is an integer number (137168304).

Almost surely, 2^1628538459 is an apocalyptic number.

1628538459 is a deficient number, since it is larger than the sum of its proper divisors (566154405).

1628538459 is a wasteful number, since it uses less digits than its factorization.

1628538459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5458.

The product of its digits is 2073600, while the sum is 51.

The square root of 1628538459 is about 40355.1540574435. The cubic root of 1628538459 is about 1176.5200689516.

The spelling of 1628538459 in words is "one billion, six hundred twenty-eight million, five hundred thirty-eight thousand, four hundred fifty-nine".