7218251172 has 240 divisors, whose sum is σ = 21544427520. Its totient is φ = 2087467200.

The previous prime is 7218251167. The next prime is 7218251197. The reversal of 7218251172 is 2711528127.

7218251172 is a `hidden beast` number, since 72 + 1 + 8 + 2 + 511 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 8727823 + ... + 8728649.

It is an arithmetic number, because the mean of its divisors is an integer number (89768448).

Almost surely, 2^7218251172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7218251172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10772213760).

7218251172 is an abundant number, since it is smaller than the sum of its proper divisors (14326176348).

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

7218251172 is a wasteful number, since it uses less digits than its factorization.

7218251172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964 (or 953 counting only the distinct ones).

The product of its digits is 15680, while the sum is 36.

The square root of 7218251172 is about 84960.2917367873. The cubic root of 7218251172 is about 1932.6089955466.

Adding to 7218251172 its reverse (2711528127), we get a palindrome (9929779299).

The spelling of 7218251172 in words is "seven billion, two hundred eighteen million, two hundred fifty-one thousand, one hundred seventy-two".