720779 has 2 divisors, whose sum is σ = 720780. Its totient is φ = 720778.

The previous prime is 720773. The next prime is 720791. The reversal of 720779 is 977027.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 720779 - 2⁴ = 720763 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (720773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360389 + 360390.

It is an arithmetic number, because the mean of its divisors is an integer number (360390).

2⁷²⁰⁷⁷⁹ is an apocalyptic number.

720779 is a deficient number, since it is larger than the sum of its proper divisors (1).

720779 is an equidigital number, since it uses as much as digits as its factorization.

720779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6174, while the sum is 32.

The square root of 720779 is about 848.9870434818. The cubic root of 720779 is about 89.6604074869.

The spelling of 720779 in words is "seven hundred twenty thousand, seven hundred seventy-nine".