87217222 has 16 divisors (see below), whose sum is σ = 134283600. Its totient is φ = 42469920.

The previous prime is 87217217. The next prime is 87217231. The reversal of 87217222 is 22271278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9472 + ... + 16252.

It is an arithmetic number, because the mean of its divisors is an integer number (8392725).

Almost surely, 2^87217222 is an apocalyptic number.

87217222 is a deficient number, since it is larger than the sum of its proper divisors (47066378).

87217222 is a wasteful number, since it uses less digits than its factorization.

87217222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6951.

The product of its digits is 6272, while the sum is 31.

The square root of 87217222 is about 9339.0161152019. The cubic root of 87217222 is about 443.4732376713.

The spelling of 87217222 in words is "eighty-seven million, two hundred seventeen thousand, two hundred twenty-two".