816740506 has 4 divisors (see below), whose sum is σ = 1225110762. Its totient is φ = 408370252.

The previous prime is 816740497. The next prime is 816740513. The reversal of 816740506 is 605047618.

816740506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 699126481 + 117614025 = 26441^2 + 10845^2 .

It is a super-2 number, since 2×816740506² = 1334130108282272072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204185125 + ... + 204185128.

Almost surely, 2^816740506 is an apocalyptic number.

816740506 is a deficient number, since it is larger than the sum of its proper divisors (408370256).

816740506 is a wasteful number, since it uses less digits than its factorization.

816740506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408370255.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 816740506 is about 28578.6722224809. The cubic root of 816740506 is about 934.7483307518.

The spelling of 816740506 in words is "eight hundred sixteen million, seven hundred forty thousand, five hundred six".