87225218 has 8 divisors (see below), whose sum is σ = 132630348. Its totient is φ = 43015104.

The previous prime is 87225217. The next prime is 87225233. The reversal of 87225218 is 81252278.

It can be written as a sum of positive squares in 2 ways, for example, as 83850649 + 3374569 = 9157^2 + 1837^2 .

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

It is not an unprimeable number, because it can be changed into a prime (87225211) 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 3 ways as a sum of consecutive naturals, for example, 298571 + ... + 298862.

Almost surely, 2^87225218 is an apocalyptic number.

87225218 is a deficient number, since it is larger than the sum of its proper divisors (45405130).

87225218 is a wasteful number, since it uses less digits than its factorization.

87225218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597508.

The product of its digits is 17920, while the sum is 35.

The square root of 87225218 is about 9339.4442018784. Note that the first 3 decimals coincide. The cubic root of 87225218 is about 443.4867896724.

The spelling of 87225218 in words is "eighty-seven million, two hundred twenty-five thousand, two hundred eighteen".