7218522630 has 128 divisors (see below), whose sum is σ = 21912560640. Its totient is φ = 1673844480.

The previous prime is 7218522599. The next prime is 7218522679. The reversal of 7218522630 is 362258127.

7218522630 is a `hidden beast` number, since 7 + 2 + 18 + 5 + 2 + 2 + 630 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15474 + ... + 121146.

It is an arithmetic number, because the mean of its divisors is an integer number (171191880).

Almost surely, 2^7218522630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7218522630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10956280320).

7218522630 is an abundant number, since it is smaller than the sum of its proper divisors (14694038010).

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

7218522630 is a wasteful number, since it uses less digits than its factorization.

7218522630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105723 (or 105717 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 7218522630 is about 84961.8892798412. The cubic root of 7218522630 is about 1932.6332218947.

The spelling of 7218522630 in words is "seven billion, two hundred eighteen million, five hundred twenty-two thousand, six hundred thirty".