820545028 has 24 divisors (see below), whose sum is σ = 1444077824. Its totient is φ = 407959200.

The previous prime is 820544999. The next prime is 820545043.

820545028 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 820544984 and 820545002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 803158 + ... + 804178.

Almost surely, 2^820545028 is an apocalyptic number.

It is an amenable number.

820545028 is a deficient number, since it is larger than the sum of its proper divisors (623532796).

820545028 is a wasteful number, since it uses less digits than its factorization.

820545028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1963 (or 1961 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 34.

The square root of 820545028 is about 28645.1571474132. The cubic root of 820545028 is about 936.1974907137.

The spelling of 820545028 in words is "eight hundred twenty million, five hundred forty-five thousand, twenty-eight".