816073385 has 4 divisors (see below), whose sum is σ = 979288068. Its totient is φ = 652858704.

The previous prime is 816073339. The next prime is 816073421. The reversal of 816073385 is 583370618.

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

It can be written as a sum of positive squares in 2 ways, for example, as 642571801 + 173501584 = 25349^2 + 13172^2 .

It is a cyclic number.

It is not a de Polignac number, because 816073385 - 2²⁰ = 815024809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81607334 + ... + 81607343.

It is an arithmetic number, because the mean of its divisors is an integer number (244822017).

Almost surely, 2^816073385 is an apocalyptic number.

It is an amenable number.

816073385 is a deficient number, since it is larger than the sum of its proper divisors (163214683).

816073385 is a wasteful number, since it uses less digits than its factorization.

816073385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163214682.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 816073385 is about 28566.9981797178. The cubic root of 816073385 is about 934.4937578088.

The spelling of 816073385 in words is "eight hundred sixteen million, seventy-three thousand, three hundred eighty-five".