728171123 has 2 divisors, whose sum is σ = 728171124. Its totient is φ = 728171122.

The previous prime is 728171083. The next prime is 728171153. The reversal of 728171123 is 321171827.

728171123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 728171123 - 2²⁰ = 727122547 is a prime.

It is a super-2 number, since 2×728171123² = 1060466368742162258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 728171123.

It is not a weakly prime, because it can be changed into another prime (728171153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364085561 + 364085562.

It is an arithmetic number, because the mean of its divisors is an integer number (364085562).

Almost surely, 2^728171123 is an apocalyptic number.

728171123 is a deficient number, since it is larger than the sum of its proper divisors (1).

728171123 is an equidigital number, since it uses as much as digits as its factorization.

728171123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 32.

The square root of 728171123 is about 26984.6460603062. The cubic root of 728171123 is about 899.6587689940.

The spelling of 728171123 in words is "seven hundred twenty-eight million, one hundred seventy-one thousand, one hundred twenty-three".