87213843 has 12 divisors (see below), whose sum is σ = 127132720. Its totient is φ = 57608496.

The previous prime is 87213839. The next prime is 87213851. The reversal of 87213843 is 34831278.

It is not a de Polignac number, because 87213843 - 2² = 87213839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87213798 and 87213807.

It is not an unprimeable number, because it can be changed into a prime (87213823) 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 11 ways as a sum of consecutive naturals, for example, 43471 + ... + 45432.

Almost surely, 2^87213843 is an apocalyptic number.

87213843 is a deficient number, since it is larger than the sum of its proper divisors (39918877).

87213843 is a wasteful number, since it uses less digits than its factorization.

87213843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89018 (or 89015 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 87213843 is about 9338.8352057417. The cubic root of 87213843 is about 443.4675105325.

The spelling of 87213843 in words is "eighty-seven million, two hundred thirteen thousand, eight hundred forty-three".