7720324660 has 12 divisors (see below), whose sum is σ = 16212681828. Its totient is φ = 3088129856.

The previous prime is 7720324649. The next prime is 7720324681. The reversal of 7720324660 is 664230277.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2582875684 + 5137448976 = 50822^2 + 71676^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193008097 + ... + 193008136.

It is an arithmetic number, because the mean of its divisors is an integer number (1351056819).

Almost surely, 2^7720324660 is an apocalyptic number.

It is an amenable number.

7720324660 is an abundant number, since it is smaller than the sum of its proper divisors (8492357168).

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

7720324660 is a wasteful number, since it uses less digits than its factorization.

7720324660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386016242 (or 386016240 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 37.

The square root of 7720324660 is about 87865.3780507431. The cubic root of 7720324660 is about 1976.4167293667.

The spelling of 7720324660 in words is "seven billion, seven hundred twenty million, three hundred twenty-four thousand, six hundred sixty".