7217764420 has 24 divisors (see below), whose sum is σ = 15159441024. Its totient is φ = 2886698976.

The previous prime is 7217764397. The next prime is 7217764429. The reversal of 7217764420 is 244677127.

It is a super-2 number, since 2×7217764420² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7217764429) 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, 149379 + ... + 191701.

It is an arithmetic number, because the mean of its divisors is an integer number (631643376).

Almost surely, 2^7217764420 is an apocalyptic number.

It is an amenable number.

7217764420 is an abundant number, since it is smaller than the sum of its proper divisors (7941676604).

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

7217764420 is a wasteful number, since it uses less digits than its factorization.

7217764420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50859 (or 50857 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 40.

The square root of 7217764420 is about 84957.4271032262. The cubic root of 7217764420 is about 1932.5655537019.

The spelling of 7217764420 in words is "seven billion, two hundred seventeen million, seven hundred sixty-four thousand, four hundred twenty".