87218009205 has 16 divisors (see below), whose sum is σ = 139796694720. Its totient is φ = 46433644928.

The previous prime is 87218009189. The next prime is 87218009231. The reversal of 87218009205 is 50290081278.

It is a cyclic number.

It is not a de Polignac number, because 87218009205 - 2⁴ = 87218009189 is a prime.

It is a super-2 number, since 2×87218009205² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5155440 + ... + 5172329.

It is an arithmetic number, because the mean of its divisors is an integer number (8737293420).

Almost surely, 2^87218009205 is an apocalyptic number.

It is an amenable number.

87218009205 is a deficient number, since it is larger than the sum of its proper divisors (52578685515).

87218009205 is a wasteful number, since it uses less digits than its factorization.

87218009205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10328340.

The product of its (nonzero) digits is 80640, while the sum is 42.

The spelling of 87218009205 in words is "eighty-seven billion, two hundred eighteen million, nine thousand, two hundred five".