816738481 has 8 divisors (see below), whose sum is σ = 903337064. Its totient is φ = 733536000.

The previous prime is 816738473. The next prime is 816738521. The reversal of 816738481 is 184837618.

It can be written as a sum of positive squares in 4 ways, for example, as 38328481 + 778410000 = 6191^2 + 27900^2 .

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 816738481 - 2³ = 816738473 is a prime.

It is a super-2 number, since 2×816738481² = 1334123492692374722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816738401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848520 + ... + 849481.

It is an arithmetic number, because the mean of its divisors is an integer number (112917133).

Almost surely, 2^816738481 is an apocalyptic number.

It is an amenable number.

816738481 is a deficient number, since it is larger than the sum of its proper divisors (86598583).

816738481 is a wasteful number, since it uses less digits than its factorization.

816738481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698051.

The product of its digits is 258048, while the sum is 46.

The square root of 816738481 is about 28578.6367939410. The cubic root of 816738481 is about 934.7475582229.

The spelling of 816738481 in words is "eight hundred sixteen million, seven hundred thirty-eight thousand, four hundred eighty-one".