87216445 has 8 divisors (see below), whose sum is σ = 104736600. Its totient is φ = 69721920.

The previous prime is 87216439. The next prime is 87216457. The reversal of 87216445 is 54461278.

It can be written as a sum of positive squares in 4 ways, for example, as 26594649 + 60621796 = 5157^2 + 7786^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87216445 - 2¹⁹ = 86692157 is a prime.

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, 2115 + ... + 13375.

It is an arithmetic number, because the mean of its divisors is an integer number (13092075).

Almost surely, 2^87216445 is an apocalyptic number.

It is an amenable number.

87216445 is a deficient number, since it is larger than the sum of its proper divisors (17520155).

87216445 is a wasteful number, since it uses less digits than its factorization.

87216445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12815.

The product of its digits is 53760, while the sum is 37.

The square root of 87216445 is about 9338.9745154380. The cubic root of 87216445 is about 443.4719207306.

The spelling of 87216445 in words is "eighty-seven million, two hundred sixteen thousand, four hundred forty-five".