7217651868 has 48 divisors (see below), whose sum is σ = 19463351040. Its totient is φ = 2039013504.

The previous prime is 7217651851. The next prime is 7217651879. The reversal of 7217651868 is 8681567127.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 7217651868.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475246 + ... + 490197.

It is an arithmetic number, because the mean of its divisors is an integer number (405486480).

Almost surely, 2^7217651868 is an apocalyptic number.

It is an amenable number.

7217651868 is an abundant number, since it is smaller than the sum of its proper divisors (12245699172).

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

7217651868 is a wasteful number, since it uses less digits than its factorization.

7217651868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965546 (or 965544 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 51.

The square root of 7217651868 is about 84956.7646982864. The cubic root of 7217651868 is about 1932.5555083362. Note that the first 4 decimals are identical.

The spelling of 7217651868 in words is "seven billion, two hundred seventeen million, six hundred fifty-one thousand, eight hundred sixty-eight".