728778 has 16 divisors (see below), whose sum is σ = 1521216. Its totient is φ = 232320.

The previous prime is 728771. The next prime is 728809. The reversal of 728778 is 877827.

It is a super-2 number, since 2×728778² = 1062234746568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (728771) 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 in 7 ways as a sum of consecutive naturals, for example, 2503 + ... + 2778.

It is an arithmetic number, because the mean of its divisors is an integer number (95076).

2⁷²⁸⁷⁷⁸ is an apocalyptic number.

728778 is an abundant number, since it is smaller than the sum of its proper divisors (792438).

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

728778 is a wasteful number, since it uses less digits than its factorization.

728778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5309.

The product of its digits is 43904, while the sum is 39.

The square root of 728778 is about 853.6849535982. The cubic root of 728778 is about 89.9908632700.

The spelling of 728778 in words is "seven hundred twenty-eight thousand, seven hundred seventy-eight".