720678285 has 12 divisors (see below), whose sum is σ = 1249175772. Its totient is φ = 384361728.

The previous prime is 720678271. The next prime is 720678289. The reversal of 720678285 is 582876027.

It can be written as a sum of positive squares in 2 ways, for example, as 418857156 + 301821129 = 20466^2 + 17373^2 .

It is not a de Polignac number, because 720678285 - 2⁴ = 720678269 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 16015073 = 720678285 / (7 + 2 + 0 + 6 + 7 + 8 + 2 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 720678285.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720678289) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 8007492 + ... + 8007581.

It is an arithmetic number, because the mean of its divisors is an integer number (104097981).

Almost surely, 2^720678285 is an apocalyptic number.

It is an amenable number.

720678285 is a deficient number, since it is larger than the sum of its proper divisors (528497487).

720678285 is a wasteful number, since it uses less digits than its factorization.

720678285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16015084 (or 16015081 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 720678285 is about 26845.4518494288. The cubic root of 720678285 is about 896.5623118668.

It can be divided in two parts, 7206 and 78285, that added together give a triangular number (85491 = T₄₁₃).

The spelling of 720678285 in words is "seven hundred twenty million, six hundred seventy-eight thousand, two hundred eighty-five".