7218995338 has 4 divisors (see below), whose sum is σ = 10828493010. Its totient is φ = 3609497668.

The previous prime is 7218995291. The next prime is 7218995347. The reversal of 7218995338 is 8335998127.

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., 5149928169 + 2069067169 = 71763^2 + 45487^2 .

It is a super-2 number, since 2×7218995338² (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 (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1804748833 + ... + 1804748836.

Almost surely, 2^7218995338 is an apocalyptic number.

7218995338 is a deficient number, since it is larger than the sum of its proper divisors (3609497672).

7218995338 is a wasteful number, since it uses less digits than its factorization.

7218995338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3609497671.

The product of its digits is 3265920, while the sum is 55.

The square root of 7218995338 is about 84964.6711168825. The cubic root of 7218995338 is about 1932.6754074078.

The spelling of 7218995338 in words is "seven billion, two hundred eighteen million, nine hundred ninety-five thousand, three hundred thirty-eight".