728426 has 4 divisors (see below), whose sum is σ = 1092642. Its totient is φ = 364212.

The previous prime is 728423. The next prime is 728437. The reversal of 728426 is 624827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 624827 = 7 ⋅89261.

It can be written as a sum of positive squares in only one way, i.e., 724201 + 4225 = 851^2 + 65^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 728426.

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

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 as a sum of consecutive naturals, namely, 182105 + ... + 182108.

2⁷²⁸⁴²⁶ is an apocalyptic number.

728426 is a deficient number, since it is larger than the sum of its proper divisors (364216).

728426 is a wasteful number, since it uses less digits than its factorization.

728426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364215.

The product of its digits is 5376, while the sum is 29.

The square root of 728426 is about 853.4787636491. The cubic root of 728426 is about 89.9763723984.

The spelling of 728426 in words is "seven hundred twenty-eight thousand, four hundred twenty-six".