728429 has 8 divisors (see below), whose sum is σ = 792120. Its totient is φ = 665856.

The previous prime is 728423. The next prime is 728437. The reversal of 728429 is 924827.

It can be written as a sum of positive squares in 4 ways, for example, as 158404 + 570025 = 398^2 + 755^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 728429 - 2⁸ = 728173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 728395 and 728404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1577 + ... + 1985.

It is an arithmetic number, because the mean of its divisors is an integer number (99015).

2⁷²⁸⁴²⁹ is an apocalyptic number.

It is an amenable number.

728429 is a deficient number, since it is larger than the sum of its proper divisors (63691).

728429 is a wasteful number, since it uses less digits than its factorization.

728429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559.

The product of its digits is 8064, while the sum is 32.

The square root of 728429 is about 853.4805211603. The cubic root of 728429 is about 89.9764959199.

The spelling of 728429 in words is "seven hundred twenty-eight thousand, four hundred twenty-nine".