7182221978 has 8 divisors (see below), whose sum is σ = 10800200340. Its totient is φ = 3582155200.

The previous prime is 7182221957. The next prime is 7182221987. The reversal of 7182221978 is 8791222817.

It can be written as a sum of positive squares in 2 ways, for example, as 6931728049 + 250493929 = 83257^2 + 15827^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 4476893 + ... + 4478496.

Almost surely, 2^7182221978 is an apocalyptic number.

7182221978 is a deficient number, since it is larger than the sum of its proper divisors (3617978362).

7182221978 is a wasteful number, since it uses less digits than its factorization.

7182221978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8955792.

The product of its digits is 225792, while the sum is 47.

The square root of 7182221978 is about 84747.9909968372. The cubic root of 7182221978 is about 1929.3881545558.

The spelling of 7182221978 in words is "seven billion, one hundred eighty-two million, two hundred twenty-one thousand, nine hundred seventy-eight".