816242618 has 16 divisors (see below), whose sum is σ = 1239691176. Its totient is φ = 403038720.

The previous prime is 816242591. The next prime is 816242627.

It is a happy number.

816242618 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 426298609 + 389944009 = 20647^2 + 19747^2 .

It is a super-2 number, since 2×816242618² = 1332504022878987848, which contains 22 as substring.

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, 57080 + ... + 69932.

Almost surely, 2^816242618 is an apocalyptic number.

816242618 is a deficient number, since it is larger than the sum of its proper divisors (423448558).

816242618 is a wasteful number, since it uses less digits than its factorization.

816242618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13249.

The product of its digits is 36864, while the sum is 38.

The square root of 816242618 is about 28569.9600629752. The cubic root of 816242618 is about 934.5583501417.

The spelling of 816242618 in words is "eight hundred sixteen million, two hundred forty-two thousand, six hundred eighteen".