84216505 has 8 divisors (see below), whose sum is σ = 101113992. Its totient is φ = 67337088.

The previous prime is 84216499. The next prime is 84216511. The reversal of 84216505 is 50561248.

It is an interprime number because it is at equal distance from previous prime (84216499) and next prime (84216511).

It can be written as a sum of positive squares in 4 ways, for example, as 3701776 + 80514729 = 1924^2 + 8973^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 84216505 - 2³ = 84216497 is a prime.

It is a Duffinian number.

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, 9967 + ... + 16363.

It is an arithmetic number, because the mean of its divisors is an integer number (12639249).

Almost surely, 2^84216505 is an apocalyptic number.

It is an amenable number.

84216505 is a deficient number, since it is larger than the sum of its proper divisors (16897487).

84216505 is a wasteful number, since it uses less digits than its factorization.

84216505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9035.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 84216505 is about 9176.9551050444. The cubic root of 84216505 is about 438.3278561806.

The spelling of 84216505 in words is "eighty-four million, two hundred sixteen thousand, five hundred five".