7721288472640 has 28 divisors (see below), whose sum is σ = 18386318176236. Its totient is φ = 3088515388928.

The previous prime is 7721288472629. The next prime is 7721288472671. The reversal of 7721288472640 is 462748821277.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1974452143104 + 5746836329536 = 1405152^2 + 2397256^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12064512919 + ... + 12064513558.

Almost surely, 2^{7721288472640} is an apocalyptic number.

It is an amenable number.

7721288472640 is an abundant number, since it is smaller than the sum of its proper divisors (10665029703596).

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

7721288472640 is a wasteful number, since it uses less digits than its factorization.

7721288472640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24129026494 (or 24129026484 counting only the distinct ones).

The product of its (nonzero) digits is 16859136, while the sum is 58.

The spelling of 7721288472640 in words is "seven trillion, seven hundred twenty-one billion, two hundred eighty-eight million, four hundred seventy-two thousand, six hundred forty".