87821059 has 4 divisors (see below), whose sum is σ = 92443240. Its totient is φ = 83198880.

The previous prime is 87821033. The next prime is 87821081. The reversal of 87821059 is 95012878.

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

It is a cyclic number.

It is not a de Polignac number, because 87821059 - 2⁹ = 87820547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87821009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2311062 + ... + 2311099.

It is an arithmetic number, because the mean of its divisors is an integer number (23110810).

Almost surely, 2^87821059 is an apocalyptic number.

87821059 is a deficient number, since it is larger than the sum of its proper divisors (4622181).

87821059 is a wasteful number, since it uses less digits than its factorization.

87821059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4622180.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 87821059 is about 9371.2890788834. The cubic root of 87821059 is about 444.4943277598.

The spelling of 87821059 in words is "eighty-seven million, eight hundred twenty-one thousand, fifty-nine".