820843028 has 24 divisors (see below), whose sum is σ = 1573425000. Its totient is φ = 372958208.

The previous prime is 820843027. The next prime is 820843031. The reversal of 820843028 is 820348028.

It can be written as a sum of positive squares in 4 ways, for example, as 93354244 + 727488784 = 9662^2 + 26972^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820843027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206153 + ... + 210096.

It is an arithmetic number, because the mean of its divisors is an integer number (65559375).

Almost surely, 2^820843028 is an apocalyptic number.

It is an amenable number.

820843028 is a deficient number, since it is larger than the sum of its proper divisors (752581972).

820843028 is a wasteful number, since it uses less digits than its factorization.

820843028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416299 (or 416297 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 820843028 is about 28650.3582525594. The cubic root of 820843028 is about 936.3108109566.

The spelling of 820843028 in words is "eight hundred twenty million, eight hundred forty-three thousand, twenty-eight".