728642 has 4 divisors (see below), whose sum is σ = 1092966. Its totient is φ = 364320.

The previous prime is 728639. The next prime is 728647. The reversal of 728642 is 246827.

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

It can be written as a sum of positive squares in only one way, i.e., 606841 + 121801 = 779^2 + 349^2 .

It is not an unprimeable number, because it can be changed into a prime (728647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182159 + ... + 182162.

2⁷²⁸⁶⁴² is an apocalyptic number.

728642 is a deficient number, since it is larger than the sum of its proper divisors (364324).

728642 is a wasteful number, since it uses less digits than its factorization.

728642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364323.

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

The square root of 728642 is about 853.6052952038. The cubic root of 728642 is about 89.9852650774.

The spelling of 728642 in words is "seven hundred twenty-eight thousand, six hundred forty-two".