7725706816 has 21 divisors (see below), whose sum is σ = 15332094939. Its totient is φ = 3862501824.

The previous prime is 7725706801. The next prime is 7725706837. The reversal of 7725706816 is 6186075277.

It is a happy number.

The square root of 7725706816 is 87896.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7725706816.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 697675 + ... + 708661.

It is an arithmetic number, because the mean of its divisors is an integer number (730099759).

Almost surely, 2^7725706816 is an apocalyptic number.

7725706816 is the 87896-th square number.

It is an amenable number.

7725706816 is a deficient number, since it is larger than the sum of its proper divisors (7606388123).

7725706816 is an frugal number, since it uses more digits than its factorization.

7725706816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21986 (or 10989 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 49.

The cubic root of 7725706816 is about 1976.8759031564.

Multiplying 7725706816 by its sum of digits (49), we get a square (378559633984 = 615272²).

The spelling of 7725706816 in words is "seven billion, seven hundred twenty-five million, seven hundred six thousand, eight hundred sixteen".