7915221216 has 576 divisors, whose sum is σ = 28768836096. Its totient is φ = 2012774400.

The previous prime is 7915221203. The next prime is 7915221239. The reversal of 7915221216 is 6121225197.

7915221216 is a `hidden beast` number, since 7 + 9 + 1 + 522 + 121 + 6 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 60421471 + ... + 60421601.

It is an arithmetic number, because the mean of its divisors is an integer number (49945896).

Almost surely, 2^7915221216 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 7915221216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14384418048).

7915221216 is an abundant number, since it is smaller than the sum of its proper divisors (20853614880).

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

7915221216 is a wasteful number, since it uses less digits than its factorization.

7915221216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 244 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 7915221216 is about 88967.5289979440. The cubic root of 7915221216 is about 1992.9099969619.

The spelling of 7915221216 in words is "seven billion, nine hundred fifteen million, two hundred twenty-one thousand, two hundred sixteen".