7818081604 has 6 divisors (see below), whose sum is σ = 13681642814. Its totient is φ = 3909040800.

The previous prime is 7818081599. The next prime is 7818081613. The reversal of 7818081604 is 4061808187.

It can be written as a sum of positive squares in only one way, i.e., 4164120900 + 3653960704 = 64530^2 + 60448^2 .

It is a super-2 number, since 2×7818081604² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977260197 + ... + 977260204.

Almost surely, 2^7818081604 is an apocalyptic number.

It is an amenable number.

7818081604 is a deficient number, since it is larger than the sum of its proper divisors (5863561210).

7818081604 is a wasteful number, since it uses less digits than its factorization.

7818081604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954520405 (or 1954520403 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 43.

The square root of 7818081604 is about 88419.9163311072. The cubic root of 7818081604 is about 1984.7237488187.

The spelling of 7818081604 in words is "seven billion, eight hundred eighteen million, eighty-one thousand, six hundred four".