728644723 has 2 divisors, whose sum is σ = 728644724. Its totient is φ = 728644722.

The previous prime is 728644711. The next prime is 728644733. The reversal of 728644723 is 327446827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 728644723 - 2²¹ = 726547571 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 728644723.

It is not a weakly prime, because it can be changed into another prime (728644703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364322361 + 364322362.

It is an arithmetic number, because the mean of its divisors is an integer number (364322362).

Almost surely, 2^728644723 is an apocalyptic number.

728644723 is a deficient number, since it is larger than the sum of its proper divisors (1).

728644723 is an equidigital number, since it uses as much as digits as its factorization.

728644723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 43.

The square root of 728644723 is about 26993.4199945098. The cubic root of 728644723 is about 899.8537717160.

The spelling of 728644723 in words is "seven hundred twenty-eight million, six hundred forty-four thousand, seven hundred twenty-three".