1528725985 has 8 divisors (see below), whose sum is σ = 1838710440. Its totient is φ = 1220154624.

The previous prime is 1528725983. The next prime is 1528726007. The reversal of 1528725985 is 5895278251.

It can be written as a sum of positive squares in 4 ways, for example, as 89889361 + 1438836624 = 9481^2 + 37932^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1528725985 - 2¹ = 1528725983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1528725983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350890 + ... + 355219.

It is an arithmetic number, because the mean of its divisors is an integer number (229838805).

Almost surely, 2^1528725985 is an apocalyptic number.

It is an amenable number.

1528725985 is a deficient number, since it is larger than the sum of its proper divisors (309984455).

1528725985 is an equidigital number, since it uses as much as digits as its factorization.

1528725985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706547.

The product of its digits is 2016000, while the sum is 52.

The square root of 1528725985 is about 39098.9256246255. The cubic root of 1528725985 is about 1151.9754289323.

The spelling of 1528725985 in words is "one billion, five hundred twenty-eight million, seven hundred twenty-five thousand, nine hundred eighty-five".