720765077 has 2 divisors, whose sum is σ = 720765078. Its totient is φ = 720765076.

The previous prime is 720765061. The next prime is 720765079. The reversal of 720765077 is 770567027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 705911761 + 14853316 = 26569^2 + 3854^2 .

It is a cyclic number.

It is not a de Polignac number, because 720765077 - 2⁴ = 720765061 is a prime.

Together with 720765079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720765079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360382538 + 360382539.

It is an arithmetic number, because the mean of its divisors is an integer number (360382539).

Almost surely, 2^720765077 is an apocalyptic number.

It is an amenable number.

720765077 is a deficient number, since it is larger than the sum of its proper divisors (1).

720765077 is an equidigital number, since it uses as much as digits as its factorization.

720765077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144060, while the sum is 41.

The square root of 720765077 is about 26847.0683129462. The cubic root of 720765077 is about 896.5983017180.

The spelling of 720765077 in words is "seven hundred twenty million, seven hundred sixty-five thousand, seventy-seven".