87533809 has 4 divisors (see below), whose sum is σ = 95491440. Its totient is φ = 79576180.

The previous prime is 87533773. The next prime is 87533819. The reversal of 87533809 is 90833578.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87533809 - 2¹⁹ = 87009521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87533819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3978799 + ... + 3978820.

It is an arithmetic number, because the mean of its divisors is an integer number (23872860).

Almost surely, 2^87533809 is an apocalyptic number.

It is an amenable number.

87533809 is a deficient number, since it is larger than the sum of its proper divisors (7957631).

87533809 is a wasteful number, since it uses less digits than its factorization.

87533809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7957630.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 87533809 is about 9355.9504594670. The cubic root of 87533809 is about 444.0091728349.

The spelling of 87533809 in words is "eighty-seven million, five hundred thirty-three thousand, eight hundred nine".