820865486 has 8 divisors (see below), whose sum is σ = 1407198000. Its totient is φ = 351799488.

The previous prime is 820865483. The next prime is 820865491. The reversal of 820865486 is 684568028.

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

It is a super-2 number, since 2×820865486² = 1347640292212032392, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 820865486.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820865483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29316611 + ... + 29316638.

It is an arithmetic number, because the mean of its divisors is an integer number (175899750).

Almost surely, 2^820865486 is an apocalyptic number.

820865486 is a deficient number, since it is larger than the sum of its proper divisors (586332514).

820865486 is a wasteful number, since it uses less digits than its factorization.

820865486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58633258.

The product of its (nonzero) digits is 737280, while the sum is 47.

The square root of 820865486 is about 28650.7501821506. The cubic root of 820865486 is about 936.3193499325.

The spelling of 820865486 in words is "eight hundred twenty million, eight hundred sixty-five thousand, four hundred eighty-six".