724128761 has 2 divisors, whose sum is σ = 724128762. Its totient is φ = 724128760.

The previous prime is 724128749. The next prime is 724128763. The reversal of 724128761 is 167821427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 508773136 + 215355625 = 22556^2 + 14675^2 .

It is a cyclic number.

It is not a de Polignac number, because 724128761 - 2¹⁰ = 724127737 is a prime.

Together with 724128763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (724128763) 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 as a sum of consecutive naturals, namely, 362064380 + 362064381.

It is an arithmetic number, because the mean of its divisors is an integer number (362064381).

Almost surely, 2^724128761 is an apocalyptic number.

It is an amenable number.

724128761 is a deficient number, since it is larger than the sum of its proper divisors (1).

724128761 is an equidigital number, since it uses as much as digits as its factorization.

724128761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 38.

The square root of 724128761 is about 26909.6406702133. The cubic root of 724128761 is about 897.9908932233.

The spelling of 724128761 in words is "seven hundred twenty-four million, one hundred twenty-eight thousand, seven hundred sixty-one".