720778027 has 4 divisors (see below), whose sum is σ = 731535976. Its totient is φ = 710020080.

The previous prime is 720778021. The next prime is 720778033. The reversal of 720778027 is 720877027.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (720778021) and next prime (720778033).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720778027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720778021) 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 3 ways as a sum of consecutive naturals, for example, 5378874 + ... + 5379007.

It is an arithmetic number, because the mean of its divisors is an integer number (182883994).

Almost surely, 2^720778027 is an apocalyptic number.

720778027 is a deficient number, since it is larger than the sum of its proper divisors (10757949).

720778027 is a wasteful number, since it uses less digits than its factorization.

720778027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10757948.

The product of its (nonzero) digits is 76832, while the sum is 40.

The square root of 720778027 is about 26847.3094927592. The cubic root of 720778027 is about 896.6036714188.

The spelling of 720778027 in words is "seven hundred twenty million, seven hundred seventy-eight thousand, twenty-seven".