87218120084 has 24 divisors (see below), whose sum is σ = 161622919080. Its totient is φ = 41040551936.

The previous prime is 87218120083. The next prime is 87218120113. The reversal of 87218120084 is 48002181278.

It can be written as a sum of positive squares in 4 ways, for example, as 76824317584 + 10393802500 = 277172^2 + 101950^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87218120083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 952922 + ... + 1040430.

It is an arithmetic number, because the mean of its divisors is an integer number (6734288295).

Almost surely, 2^87218120084 is an apocalyptic number.

It is an amenable number.

87218120084 is a deficient number, since it is larger than the sum of its proper divisors (74404798996).

87218120084 is a wasteful number, since it uses less digits than its factorization.

87218120084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102187 (or 102185 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 41.

The spelling of 87218120084 in words is "eighty-seven billion, two hundred eighteen million, one hundred twenty thousand, eighty-four".