87822571 has 4 divisors (see below), whose sum is σ = 90196192. Its totient is φ = 85448952.

The previous prime is 87822557. The next prime is 87822587. The reversal of 87822571 is 17522878.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17522878 = 2 ⋅8761439.

It is a cyclic number.

It is not a de Polignac number, because 87822571 - 2¹⁹ = 87298283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87822521) 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 3 ways as a sum of consecutive naturals, for example, 1186755 + ... + 1186828.

It is an arithmetic number, because the mean of its divisors is an integer number (22549048).

Almost surely, 2^87822571 is an apocalyptic number.

87822571 is a deficient number, since it is larger than the sum of its proper divisors (2373621).

87822571 is a wasteful number, since it uses less digits than its factorization.

87822571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373620.

The product of its digits is 62720, while the sum is 40.

The square root of 87822571 is about 9371.3697504687. The cubic root of 87822571 is about 444.4968786725.

The spelling of 87822571 in words is "eighty-seven million, eight hundred twenty-two thousand, five hundred seventy-one".