728728723 has 2 divisors, whose sum is σ = 728728724. Its totient is φ = 728728722.

The previous prime is 728728709. The next prime is 728728769. The reversal of 728728723 is 327827827.

It is an a-pointer prime, because the next prime (728728769) can be obtained adding 728728723 to its sum of digits (46).

It is a weak prime.

It is an emirp because it is prime and its reverse (327827827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728728723 - 2¹⁷ = 728597651 is a prime.

It is not a weakly prime, because it can be changed into another prime (728738723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364364361 + 364364362.

It is an arithmetic number, because the mean of its divisors is an integer number (364364362).

Almost surely, 2^728728723 is an apocalyptic number.

728728723 is a deficient number, since it is larger than the sum of its proper divisors (1).

728728723 is an equidigital number, since it uses as much as digits as its factorization.

728728723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 526848, while the sum is 46.

The square root of 728728723 is about 26994.9758844123. The cubic root of 728728723 is about 899.8883495241. Note that the first 3 decimals are identical.

The spelling of 728728723 in words is "seven hundred twenty-eight million, seven hundred twenty-eight thousand, seven hundred twenty-three".