7221005280 has 384 divisors, whose sum is σ = 26366860800. Its totient is φ = 1844121600.

The previous prime is 7221005269. The next prime is 7221005303. The reversal of 7221005280 is 825001227.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 10449735 + ... + 10450425.

It is an arithmetic number, because the mean of its divisors is an integer number (68663700).

Almost surely, 2^7221005280 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 7221005280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13183430400).

7221005280 is an abundant number, since it is smaller than the sum of its proper divisors (19145855520).

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

7221005280 is a wasteful number, since it uses less digits than its factorization.

7221005280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815 (or 801 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 7221005280 is about 84976.4983980865. The cubic root of 7221005280 is about 1932.8547585423.

The spelling of 7221005280 in words is "seven billion, two hundred twenty-one million, five thousand, two hundred eighty".