1428728585 has 4 divisors (see below), whose sum is σ = 1714474308. Its totient is φ = 1142982864.

The previous prime is 1428728563. The next prime is 1428728611. The reversal of 1428728585 is 5858278241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 498539584 + 930189001 = 22328^2 + 30499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1428728585 is a prime.

It is a super-2 number, since 2×1428728585² = 4082530739192204450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 142872854 + ... + 142872863.

It is an arithmetic number, because the mean of its divisors is an integer number (428618577).

Almost surely, 2^1428728585 is an apocalyptic number.

It is an amenable number.

1428728585 is a deficient number, since it is larger than the sum of its proper divisors (285745723).

1428728585 is an equidigital number, since it uses as much as digits as its factorization.

1428728585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285745722.

The product of its digits is 1433600, while the sum is 50.

The square root of 1428728585 is about 37798.5262278835. The cubic root of 1428728585 is about 1126.2891782513.

The spelling of 1428728585 in words is "one billion, four hundred twenty-eight million, seven hundred twenty-eight thousand, five hundred eighty-five".