820857088 has 36 divisors (see below), whose sum is σ = 1666309680. Its totient is φ = 403464704.

The previous prime is 820857083. The next prime is 820857127. The reversal of 820857088 is 880758028.

It is not an unprimeable number, because it can be changed into a prime (820857083) by changing a digit.

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, 12070 + ... + 42277.

It is an arithmetic number, because the mean of its divisors is an integer number (46286380).

Almost surely, 2^820857088 is an apocalyptic number.

It is an amenable number.

820857088 is an abundant number, since it is smaller than the sum of its proper divisors (845452592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820857088 is an equidigital number, since it uses as much as digits as its factorization.

820857088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54422 (or 54408 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 46.

The square root of 820857088 is about 28650.6036236586. The cubic root of 820857088 is about 936.3161568650.

The spelling of 820857088 in words is "eight hundred twenty million, eight hundred fifty-seven thousand, eighty-eight".