7218728722 has 8 divisors (see below), whose sum is σ = 10836256896. Its totient is φ = 3606643092.

The previous prime is 7218728701. The next prime is 7218728723. The reversal of 7218728722 is 2278278127.

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

It is a super-2 number, since 2×7218728722² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7218728723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1357318 + ... + 1362625.

It is an arithmetic number, because the mean of its divisors is an integer number (1354532112).

Almost surely, 2^7218728722 is an apocalyptic number.

7218728722 is a deficient number, since it is larger than the sum of its proper divisors (3617528174).

7218728722 is a wasteful number, since it uses less digits than its factorization.

7218728722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2721272.

The product of its digits is 351232, while the sum is 46.

The square root of 7218728722 is about 84963.1021208619. The cubic root of 7218728722 is about 1932.6516142295.

The spelling of 7218728722 in words is "seven billion, two hundred eighteen million, seven hundred twenty-eight thousand, seven hundred twenty-two".