728129 has 2 divisors, whose sum is σ = 728130. Its totient is φ = 728128.

The previous prime is 728113. The next prime is 728131. The reversal of 728129 is 921827.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 719104 + 9025 = 848^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 728129 - 2⁴ = 728113 is a prime.

Together with 728131, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₅₈₆₄₆ and since 728129 and 58646 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (728729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364064 + 364065.

It is an arithmetic number, because the mean of its divisors is an integer number (364065).

2⁷²⁸¹²⁹ is an apocalyptic number.

It is an amenable number.

728129 is a deficient number, since it is larger than the sum of its proper divisors (1).

728129 is an equidigital number, since it uses as much as digits as its factorization.

728129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 29.

The square root of 728129 is about 853.3047521255. The cubic root of 728129 is about 89.9641420939.

The spelling of 728129 in words is "seven hundred twenty-eight thousand, one hundred twenty-nine".