7215225318 has 48 divisors (see below), whose sum is σ = 17975932416. Its totient is φ = 2048839920.

The previous prime is 7215225313. The next prime is 7215225337. The reversal of 7215225318 is 8135225127.

7215225318 is a `hidden beast` number, since 72 + 1 + 52 + 2 + 531 + 8 = 666.

It is a super-2 number, since 2×7215225318² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7215225313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155118 + ... + 196193.

It is an arithmetic number, because the mean of its divisors is an integer number (374498592).

Almost surely, 2^7215225318 is an apocalyptic number.

7215225318 is an abundant number, since it is smaller than the sum of its proper divisors (10760707098).

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

7215225318 is a wasteful number, since it uses less digits than its factorization.

7215225318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351489 (or 351486 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 7215225318 is about 84942.4824101580. The cubic root of 7215225318 is about 1932.3389111992.

The spelling of 7215225318 in words is "seven billion, two hundred fifteen million, two hundred twenty-five thousand, three hundred eighteen".