84816505 has 4 divisors (see below), whose sum is σ = 101779812. Its totient is φ = 67853200.

The previous prime is 84816493. The next prime is 84816517. The reversal of 84816505 is 50561848.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (84816493) and next prime (84816517).

It can be written as a sum of positive squares in 2 ways, for example, as 29030544 + 55785961 = 5388^2 + 7469^2 .

It is not a de Polignac number, because 84816505 - 2¹⁵ = 84783737 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8481646 + ... + 8481655.

It is an arithmetic number, because the mean of its divisors is an integer number (25444953).

Almost surely, 2^84816505 is an apocalyptic number.

It is an amenable number.

84816505 is a deficient number, since it is larger than the sum of its proper divisors (16963307).

84816505 is a wasteful number, since it uses less digits than its factorization.

84816505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16963306.

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 84816505 is about 9209.5876672086. The cubic root of 84816505 is about 439.3663485809.

The spelling of 84816505 in words is "eighty-four million, eight hundred sixteen thousand, five hundred five".