720650761 has 2 divisors, whose sum is σ = 720650762. Its totient is φ = 720650760.

The previous prime is 720650747. The next prime is 720650773. The reversal of 720650761 is 167056027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 554885136 + 165765625 = 23556^2 + 12875^2 .

It is a cyclic number.

It is not a de Polignac number, because 720650761 - 2⁵ = 720650729 is a prime.

It is equal to p_37266145 and since 720650761 and 37266145 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (720650701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360325380 + 360325381.

It is an arithmetic number, because the mean of its divisors is an integer number (360325381).

Almost surely, 2^720650761 is an apocalyptic number.

It is an amenable number.

720650761 is a deficient number, since it is larger than the sum of its proper divisors (1).

720650761 is an equidigital number, since it uses as much as digits as its factorization.

720650761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 720650761 is about 26844.9392064873. The cubic root of 720650761 is about 896.5508979457.

The spelling of 720650761 in words is "seven hundred twenty million, six hundred fifty thousand, seven hundred sixty-one".