820261886 has 16 divisors (see below), whose sum is σ = 1239764064. Its totient is φ = 407013984.

The previous prime is 820261877. The next prime is 820261889. The reversal of 820261886 is 688162028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820261889) 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 7 ways as a sum of consecutive naturals, for example, 483656 + ... + 485348.

It is an arithmetic number, because the mean of its divisors is an integer number (77485254).

Almost surely, 2^820261886 is an apocalyptic number.

820261886 is a deficient number, since it is larger than the sum of its proper divisors (419502178).

820261886 is a wasteful number, since it uses less digits than its factorization.

820261886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3395.

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 820261886 is about 28640.2144894203. The cubic root of 820261886 is about 936.0897950902.

The spelling of 820261886 in words is "eight hundred twenty million, two hundred sixty-one thousand, eight hundred eighty-six".