87823971 has 6 divisors (see below), whose sum is σ = 126856860. Its totient is φ = 58549308.

The previous prime is 87823963. The next prime is 87823993. The reversal of 87823971 is 17932878.

It is not a de Polignac number, because 87823971 - 2³ = 87823963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87823171) 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 5 ways as a sum of consecutive naturals, for example, 4879101 + ... + 4879118.

It is an arithmetic number, because the mean of its divisors is an integer number (21142810).

Almost surely, 2^87823971 is an apocalyptic number.

87823971 is a deficient number, since it is larger than the sum of its proper divisors (39032889).

87823971 is a wasteful number, since it uses less digits than its factorization.

87823971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9758225 (or 9758222 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 87823971 is about 9371.4444457618. Note that the first 5 decimals coincide. The cubic root of 87823971 is about 444.4992406026.

The spelling of 87823971 in words is "eighty-seven million, eight hundred twenty-three thousand, nine hundred seventy-one".