728434 has 12 divisors (see below), whose sum is σ = 1271214. Its totient is φ = 312144.

The previous prime is 728423. The next prime is 728437. The reversal of 728434 is 434827.

It can be written as a sum of positive squares in only one way, i.e., 717409 + 11025 = 847^2 + 105^2 .

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

728434 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 5 ways as a sum of consecutive naturals, for example, 3619 + ... + 3814.

2⁷²⁸⁴³⁴ is an apocalyptic number.

728434 is a deficient number, since it is larger than the sum of its proper divisors (542780).

728434 is a wasteful number, since it uses less digits than its factorization.

728434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7449 (or 7442 counting only the distinct ones).

The product of its digits is 5376, while the sum is 28.

The square root of 728434 is about 853.4834503375. The cubic root of 728434 is about 89.9767017883.

It can be divided in two parts, 7 and 28434, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 728434 in words is "seven hundred twenty-eight thousand, four hundred thirty-four".