820404028 has 6 divisors (see below), whose sum is σ = 1435707056. Its totient is φ = 410202012.

The previous prime is 820404023. The next prime is 820404029.

820404028 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 820403987 and 820404005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820404023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102550500 + ... + 102550507.

Almost surely, 2^820404028 is an apocalyptic number.

It is an amenable number.

820404028 is a deficient number, since it is larger than the sum of its proper divisors (615303028).

820404028 is a wasteful number, since it uses less digits than its factorization.

820404028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205101011 (or 205101009 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 820404028 is about 28642.6958926704. The cubic root of 820404028 is about 936.1438631843.

It can be divided in two parts, 82040 and 4028, that added together give a palindrome (86068).

The spelling of 820404028 in words is "eight hundred twenty million, four hundred four thousand, twenty-eight".