87212218 has 8 divisors (see below), whose sum is σ = 130860180. Its totient is φ = 43592160.

The previous prime is 87212197. The next prime is 87212231. The reversal of 87212218 is 81221278.

It can be written as a sum of positive squares in 2 ways, for example, as 86731969 + 480249 = 9313^2 + 693^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 87212218.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4848 + ... + 14068.

Almost surely, 2^87212218 is an apocalyptic number.

87212218 is a deficient number, since it is larger than the sum of its proper divisors (43647962).

87212218 is a wasteful number, since it uses less digits than its factorization.

87212218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13952.

The product of its digits is 3584, while the sum is 31.

The square root of 87212218 is about 9338.7482030516. The cubic root of 87212218 is about 443.4647562328.

The spelling of 87212218 in words is "eighty-seven million, two hundred twelve thousand, two hundred eighteen".