7218773120 has 64 divisors (see below), whose sum is σ = 18584891640. Its totient is φ = 2665390080.

The previous prime is 7218773071. The next prime is 7218773129. The reversal of 7218773120 is 213778127.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3805409344 + 3413363776 = 61688^2 + 58424^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×7218773120² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7218773129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425501 + ... + 442140.

Almost surely, 2^7218773120 is an apocalyptic number.

It is an amenable number.

7218773120 is an abundant number, since it is smaller than the sum of its proper divisors (11366118520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7218773120 is a wasteful number, since it uses less digits than its factorization.

7218773120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867673 (or 867661 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 7218773120 is about 84963.3633985849. The cubic root of 7218773120 is about 1932.6555764087.

The spelling of 7218773120 in words is "seven billion, two hundred eighteen million, seven hundred seventy-three thousand, one hundred twenty".