7721321600 has 96 divisors (see below), whose sum is σ = 19106068800. Its totient is φ = 3083351040.

The previous prime is 7721321599. The next prime is 7721321611. The reversal of 7721321600 is 61231277.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2324741 + ... + 2328059.

It is an arithmetic number, because the mean of its divisors is an integer number (199021550).

Almost surely, 2^7721321600 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 7721321600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9553034400).

7721321600 is an abundant number, since it is smaller than the sum of its proper divisors (11384747200).

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

7721321600 is a wasteful number, since it uses less digits than its factorization.

7721321600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4070 (or 4053 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 7721321600 is about 87871.0509781236. The cubic root of 7721321600 is about 1976.5017985045.

Adding to 7721321600 its reverse (61231277), we get a palindrome (7782552877).

The spelling of 7721321600 in words is "seven billion, seven hundred twenty-one million, three hundred twenty-one thousand, six hundred".