87217223 has 4 divisors (see below), whose sum is σ = 87302688. Its totient is φ = 87131760.

The previous prime is 87217217. The next prime is 87217231. The reversal of 87217223 is 32271278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87217223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87217223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87217243) 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, 41183 + ... + 43248.

It is an arithmetic number, because the mean of its divisors is an integer number (21825672).

Almost surely, 2^87217223 is an apocalyptic number.

87217223 is a deficient number, since it is larger than the sum of its proper divisors (85465).

87217223 is a wasteful number, since it uses less digits than its factorization.

87217223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85464.

The product of its digits is 9408, while the sum is 32.

The square root of 87217223 is about 9339.0161687407. The cubic root of 87217223 is about 443.4732393662.

The spelling of 87217223 in words is "eighty-seven million, two hundred seventeen thousand, two hundred twenty-three".