87228220 has 24 divisors (see below), whose sum is σ = 185071824. Its totient is φ = 34530816.

The previous prime is 87228191. The next prime is 87228227. The reversal of 87228220 is 2282278.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87228227) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 20542 + ... + 24421.

It is an arithmetic number, because the mean of its divisors is an integer number (7711326).

Almost surely, 2^87228220 is an apocalyptic number.

It is an amenable number.

87228220 is an abundant number, since it is smaller than the sum of its proper divisors (97843604).

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

87228220 is a wasteful number, since it uses less digits than its factorization.

87228220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45069 (or 45067 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 87228220 is about 9339.6049166975. The cubic root of 87228220 is about 443.4918773909.

It can be divided in two parts, 872 and 28220, that added together give a palindrome (29092).

The spelling of 87228220 in words is "eighty-seven million, two hundred twenty-eight thousand, two hundred twenty".