820158628 has 12 divisors (see below), whose sum is σ = 1484770140. Its totient is φ = 395938592.

The previous prime is 820158589. The next prime is 820158631. The reversal of 820158628 is 826851028.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 212634724 + 607523904 = 14582^2 + 24648^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3535051 + ... + 3535282.

It is an arithmetic number, because the mean of its divisors is an integer number (123730845).

Almost surely, 2^820158628 is an apocalyptic number.

It is an amenable number.

820158628 is a deficient number, since it is larger than the sum of its proper divisors (664611512).

820158628 is a wasteful number, since it uses less digits than its factorization.

820158628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7070366 (or 7070364 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 820158628 is about 28638.4117576377. The cubic root of 820158628 is about 936.0505138078.

The spelling of 820158628 in words is "eight hundred twenty million, one hundred fifty-eight thousand, six hundred twenty-eight".