87216437 has 40 divisors (see below), whose sum is σ = 117502080. Its totient is φ = 63249120.

The previous prime is 87216433. The next prime is 87216439. The reversal of 87216437 is 73461278.

It is not a de Polignac number, because 87216437 - 2² = 87216433 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 87216437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87216433) 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 39 ways as a sum of consecutive naturals, for example, 2357183 + ... + 2357219.

It is an arithmetic number, because the mean of its divisors is an integer number (2937552).

Almost surely, 2^87216437 is an apocalyptic number.

It is an amenable number.

87216437 is a deficient number, since it is larger than the sum of its proper divisors (30285643).

87216437 is an equidigital number, since it uses as much as digits as its factorization.

87216437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 78 counting only the distinct ones).

The product of its digits is 56448, while the sum is 38.

The square root of 87216437 is about 9338.9740871254. The cubic root of 87216437 is about 443.4719071714.

The spelling of 87216437 in words is "eighty-seven million, two hundred sixteen thousand, four hundred thirty-seven".