720564389 has 2 divisors, whose sum is σ = 720564390. Its totient is φ = 720564388.

The previous prime is 720564359. The next prime is 720564433. The reversal of 720564389 is 983465027.

It is an a-pointer prime, because the next prime (720564433) can be obtained adding 720564389 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 663062500 + 57501889 = 25750^2 + 7583^2 .

It is a cyclic number.

It is not a de Polignac number, because 720564389 - 2¹⁶ = 720498853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720564319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360282194 + 360282195.

It is an arithmetic number, because the mean of its divisors is an integer number (360282195).

Almost surely, 2^720564389 is an apocalyptic number.

It is an amenable number.

720564389 is a deficient number, since it is larger than the sum of its proper divisors (1).

720564389 is an equidigital number, since it uses as much as digits as its factorization.

720564389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 720564389 is about 26843.3304379319. The cubic root of 720564389 is about 896.5150784743.

The spelling of 720564389 in words is "seven hundred twenty million, five hundred sixty-four thousand, three hundred eighty-nine".