720766745 has 8 divisors (see below), whose sum is σ = 873837384. Its totient is φ = 570668544.

The previous prime is 720766703. The next prime is 720766807. The reversal of 720766745 is 547667027.

720766745 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 4 ways, for example, as 228281881 + 492484864 = 15109^2 + 22192^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 720766745 - 2¹⁴ = 720750361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 720766696 and 720766705.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 742574 + ... + 743543.

It is an arithmetic number, because the mean of its divisors is an integer number (109229673).

Almost surely, 2^720766745 is an apocalyptic number.

It is an amenable number.

720766745 is a deficient number, since it is larger than the sum of its proper divisors (153070639).

720766745 is a wasteful number, since it uses less digits than its factorization.

720766745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486219.

The product of its (nonzero) digits is 493920, while the sum is 44.

The square root of 720766745 is about 26847.0993777726. The cubic root of 720766745 is about 896.5989933556.

The spelling of 720766745 in words is "seven hundred twenty million, seven hundred sixty-six thousand, seven hundred forty-five".