720521168 has 20 divisors (see below), whose sum is σ = 1396742820. Its totient is φ = 360071424.

The previous prime is 720521143. The next prime is 720521177. The reversal of 720521168 is 861125027.

720521168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 348494224 + 372026944 = 18668^2 + 19288^2 .

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, 22646 + ... + 44202.

It is an arithmetic number, because the mean of its divisors is an integer number (69837141).

Almost surely, 2^720521168 is an apocalyptic number.

It is an amenable number.

720521168 is a deficient number, since it is larger than the sum of its proper divisors (676221652).

720521168 is a wasteful number, since it uses less digits than its factorization.

720521168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23654 (or 23648 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 720521168 is about 26842.5253655464. The cubic root of 720521168 is about 896.4971531491.

The spelling of 720521168 in words is "seven hundred twenty million, five hundred twenty-one thousand, one hundred sixty-eight".