781028 has 12 divisors (see below), whose sum is σ = 1414140. Its totient is φ = 376992.

The previous prime is 781021. The next prime is 781043. The reversal of 781028 is 820187.

It can be written as a sum of positive squares in 2 ways, for example, as 652864 + 128164 = 808^2 + 358^2 .

It is a super-2 number, since 2×781028² = 1220009473568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 780988 and 781006.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 781028.

It is not an unprimeable number, because it can be changed into a prime (781021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3251 + ... + 3482.

It is an arithmetic number, because the mean of its divisors is an integer number (117845).

2⁷⁸¹⁰²⁸ is an apocalyptic number.

It is an amenable number.

781028 is a deficient number, since it is larger than the sum of its proper divisors (633112).

781028 is a wasteful number, since it uses less digits than its factorization.

781028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6766 (or 6764 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 781028 is about 883.7578853962. The cubic root of 781028 is about 92.0920628530.

The spelling of 781028 in words is "seven hundred eighty-one thousand, twenty-eight".