728435 has 4 divisors (see below), whose sum is σ = 874128. Its totient is φ = 582744.

The previous prime is 728423. The next prime is 728437. The reversal of 728435 is 534827.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 728435 - 2¹⁴ = 712051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 728398 and 728407.

It is not an unprimeable number, because it can be changed into a prime (728437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72839 + ... + 72848.

It is an arithmetic number, because the mean of its divisors is an integer number (218532).

2⁷²⁸⁴³⁵ is an apocalyptic number.

728435 is a deficient number, since it is larger than the sum of its proper divisors (145693).

728435 is a wasteful number, since it uses less digits than its factorization.

728435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145692.

The product of its digits is 6720, while the sum is 29.

The square root of 728435 is about 853.4840361717. The cubic root of 728435 is about 89.9767429618.

The spelling of 728435 in words is "seven hundred twenty-eight thousand, four hundred thirty-five".