820428842 has 8 divisors (see below), whose sum is σ = 1236828000. Its totient is φ = 408152844.

The previous prime is 820428841. The next prime is 820428877. The reversal of 820428842 is 248824028.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 820428796 and 820428805.

It is not an unprimeable number, because it can be changed into a prime (820428841) 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, 1030292 + ... + 1031087.

It is an arithmetic number, because the mean of its divisors is an integer number (154603500).

Almost surely, 2^820428842 is an apocalyptic number.

820428842 is a deficient number, since it is larger than the sum of its proper divisors (416399158).

820428842 is a wasteful number, since it uses less digits than its factorization.

820428842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061580.

The product of its (nonzero) digits is 65536, while the sum is 38.

The square root of 820428842 is about 28643.1290539284. The cubic root of 820428842 is about 936.1533013143.

The spelling of 820428842 in words is "eight hundred twenty million, four hundred twenty-eight thousand, eight hundred forty-two".