87313220 has 24 divisors (see below), whose sum is σ = 187623744. Its totient is φ = 34112736.

The previous prime is 87313211. The next prime is 87313253. The reversal of 87313220 is 2231378.

It is a self number, because there is not a number n which added to its sum of digits gives 87313220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49904 + ... + 51623.

It is an arithmetic number, because the mean of its divisors is an integer number (7817656).

Almost surely, 2^87313220 is an apocalyptic number.

It is an amenable number.

87313220 is an abundant number, since it is smaller than the sum of its proper divisors (100310524).

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

87313220 is a wasteful number, since it uses less digits than its factorization.

87313220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101579 (or 101577 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 87313220 is about 9344.1543223558. The cubic root of 87313220 is about 443.6358849593.

Adding to 87313220 its reverse (2231378), we get a palindrome (89544598).

The spelling of 87313220 in words is "eighty-seven million, three hundred thirteen thousand, two hundred twenty".