87220212 has 12 divisors (see below), whose sum is σ = 203513856. Its totient is φ = 29073400.

The previous prime is 87220153. The next prime is 87220247. The reversal of 87220212 is 21202278.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3634164 + ... + 3634187.

It is an arithmetic number, because the mean of its divisors is an integer number (16959488).

Almost surely, 2^87220212 is an apocalyptic number.

It is an amenable number.

87220212 is an abundant number, since it is smaller than the sum of its proper divisors (116293644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87220212 is a wasteful number, since it uses less digits than its factorization.

87220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7268358 (or 7268356 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 87220212 is about 9339.1761949328. The cubic root of 87220212 is about 443.4783053625.

The spelling of 87220212 in words is "eighty-seven million, two hundred twenty thousand, two hundred twelve".