728786 has 4 divisors (see below), whose sum is σ = 1093182. Its totient is φ = 364392.

The previous prime is 728771. The next prime is 728809. The reversal of 728786 is 687827.

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., 398161 + 330625 = 631^2 + 575^2 .

It is a super-2 number, since 2×728786² = 1062258067592, which contains 22 as substring.

It is an unprimeable 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 as a sum of consecutive naturals, namely, 182195 + ... + 182198.

2⁷²⁸⁷⁸⁶ is an apocalyptic number.

728786 is a deficient number, since it is larger than the sum of its proper divisors (364396).

728786 is a wasteful number, since it uses less digits than its factorization.

728786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364395.

The product of its digits is 37632, while the sum is 38.

The square root of 728786 is about 853.6896391547. The cubic root of 728786 is about 89.9911925538.

The spelling of 728786 in words is "seven hundred twenty-eight thousand, seven hundred eighty-six".