816282505 has 8 divisors (see below), whose sum is σ = 989238024. Its totient is φ = 646560000.

The previous prime is 816282487. The next prime is 816282547. The reversal of 816282505 is 505282618.

It can be written as a sum of positive squares in 4 ways, for example, as 236821321 + 579461184 = 15389^2 + 24072^2 .

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

It is not a de Polignac number, because 816282505 - 2¹¹ = 816280457 is a prime.

It is a Duffinian 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, 807696 + ... + 808705.

It is an arithmetic number, because the mean of its divisors is an integer number (123654753).

Almost surely, 2^816282505 is an apocalyptic number.

It is an amenable number.

816282505 is a deficient number, since it is larger than the sum of its proper divisors (172955519).

816282505 is a wasteful number, since it uses less digits than its factorization.

816282505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616507.

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

The square root of 816282505 is about 28570.6581128262. The cubic root of 816282505 is about 934.5735727896.

The spelling of 816282505 in words is "eight hundred sixteen million, two hundred eighty-two thousand, five hundred five".