7217455172 has 48 divisors (see below), whose sum is σ = 13571566848. Its totient is φ = 3352538880.

The previous prime is 7217455171. The next prime is 7217455207. The reversal of 7217455172 is 2715547127.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (7217455171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272543 + ... + 297849.

It is an arithmetic number, because the mean of its divisors is an integer number (282740976).

Almost surely, 2^7217455172 is an apocalyptic number.

It is an amenable number.

7217455172 is a deficient number, since it is larger than the sum of its proper divisors (6354111676).

7217455172 is a wasteful number, since it uses less digits than its factorization.

7217455172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25436 (or 25434 counting only the distinct ones).

The product of its digits is 137200, while the sum is 41.

The square root of 7217455172 is about 84955.6070662790. The cubic root of 7217455172 is about 1932.5379527933.

The spelling of 7217455172 in words is "seven billion, two hundred seventeen million, four hundred fifty-five thousand, one hundred seventy-two".