87532809 has 32 divisors (see below), whose sum is σ = 148291584. Its totient is φ = 44677440.

The previous prime is 87532801. The next prime is 87532811. The reversal of 87532809 is 90823578.

It is not a de Polignac number, because 87532809 - 2³ = 87532801 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87532801) 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 31 ways as a sum of consecutive naturals, for example, 3292 + ... + 13634.

It is an arithmetic number, because the mean of its divisors is an integer number (4634112).

Almost surely, 2^87532809 is an apocalyptic number.

It is an amenable number.

87532809 is a deficient number, since it is larger than the sum of its proper divisors (60758775).

87532809 is a wasteful number, since it uses less digits than its factorization.

87532809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10397.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 87532809 is about 9355.8970173896. The cubic root of 87532809 is about 444.0074820182.

The spelling of 87532809 in words is "eighty-seven million, five hundred thirty-two thousand, eight hundred nine".