7217420538 has 16 divisors (see below), whose sum is σ = 14707197216. Its totient is φ = 2360414160.

The previous prime is 7217420521. The next prime is 7217420549. The reversal of 7217420538 is 8350247127.

It is a junction number, because it is equal to n+sod(n) for n = 7217420496 and 7217420505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11347828 + ... + 11348463.

It is an arithmetic number, because the mean of its divisors is an integer number (919199826).

Almost surely, 2^7217420538 is an apocalyptic number.

7217420538 is an abundant number, since it is smaller than the sum of its proper divisors (7489776678).

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

7217420538 is a wasteful number, since it uses less digits than its factorization.

7217420538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22696349.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 7217420538 is about 84955.4032301654. The cubic root of 7217420538 is about 1932.5348616009.

The spelling of 7217420538 in words is "seven billion, two hundred seventeen million, four hundred twenty thousand, five hundred thirty-eight".