1528729509 has 16 divisors (see below), whose sum is σ = 2078654400. Its totient is φ = 999014016.

The previous prime is 1528729487. The next prime is 1528729513. The reversal of 1528729509 is 9059278251.

It is not a de Polignac number, because 1528729509 - 2¹¹ = 1528727461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1528729529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201222 + ... + 208680.

It is an arithmetic number, because the mean of its divisors is an integer number (129915900).

Almost surely, 2^1528729509 is an apocalyptic number.

It is an amenable number.

1528729509 is a deficient number, since it is larger than the sum of its proper divisors (549924891).

1528729509 is a wasteful number, since it uses less digits than its factorization.

1528729509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8804.

The product of its (nonzero) digits is 453600, while the sum is 48.

The square root of 1528729509 is about 39098.9706897765. The cubic root of 1528729509 is about 1151.9763141048.

The spelling of 1528729509 in words is "one billion, five hundred twenty-eight million, seven hundred twenty-nine thousand, five hundred nine".