728436 has 12 divisors (see below), whose sum is σ = 1699712. Its totient is φ = 242808.

The previous prime is 728423. The next prime is 728437. The reversal of 728436 is 634827.

It is a tau number, because it is divible by the number of its divisors (12).

It is a d-powerful number, because it can be written as 7³ + 2¹⁷ + 4⁸ + 8 + 3¹² + 6² .

It is a congruent number.

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

728436 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30340 + ... + 30363.

2⁷²⁸⁴³⁶ is an apocalyptic number.

It is an amenable number.

728436 is an abundant number, since it is smaller than the sum of its proper divisors (971276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

728436 is a wasteful number, since it uses less digits than its factorization.

728436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60710 (or 60708 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 728436 is about 853.4846220056. The cubic root of 728436 is about 89.9767841353.

The spelling of 728436 in words is "seven hundred twenty-eight thousand, four hundred thirty-six".