7221015648 has 192 divisors, whose sum is σ = 26258480640. Its totient is φ = 1875571200.

The previous prime is 7221015629. The next prime is 7221015649. The reversal of 7221015648 is 8465101227.

7221015648 is a `hidden beast` number, since 7 + 2 + 2 + 1 + 0 + 1 + 5 + 648 = 666.

It is a super-3 number, since 3×7221015648³ (a number of 31 digits) contains 333 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221015649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12258 + ... + 120798.

It is an arithmetic number, because the mean of its divisors is an integer number (136762920).

Almost surely, 2^7221015648 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 7221015648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13129240320).

7221015648 is an abundant number, since it is smaller than the sum of its proper divisors (19037464992).

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

7221015648 is a wasteful number, since it uses less digits than its factorization.

7221015648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108578 (or 108564 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 7221015648 is about 84976.5594031672. The cubic root of 7221015648 is about 1932.8556836133.

The spelling of 7221015648 in words is "seven billion, two hundred twenty-one million, fifteen thousand, six hundred forty-eight".