820919256 has 32 divisors (see below), whose sum is σ = 2173022640. Its totient is φ = 257543168.

The previous prime is 820919251. The next prime is 820919293. The reversal of 820919256 is 652919028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820919251) 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, 1005621 + ... + 1006436.

Almost surely, 2^820919256 is an apocalyptic number.

It is an amenable number.

820919256 is an abundant number, since it is smaller than the sum of its proper divisors (1352103384).

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

820919256 is a wasteful number, since it uses less digits than its factorization.

820919256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012083 (or 2012079 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 820919256 is about 28651.6885366290. The cubic root of 820919256 is about 936.3397937173.

The spelling of 820919256 in words is "eight hundred twenty million, nine hundred nineteen thousand, two hundred fifty-six".