820645411 has 8 divisors (see below), whose sum is σ = 841587824. Its totient is φ = 799787520.

The previous prime is 820645409. The next prime is 820645421. The reversal of 820645411 is 114546028.

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

It is a cyclic number.

It is not a de Polignac number, because 820645411 - 2¹ = 820645409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820645421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1230 + ... + 40531.

It is an arithmetic number, because the mean of its divisors is an integer number (105198478).

Almost surely, 2^820645411 is an apocalyptic number.

820645411 is a deficient number, since it is larger than the sum of its proper divisors (20942413).

820645411 is a wasteful number, since it uses less digits than its factorization.

820645411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42261.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 820645411 is about 28646.9092748240. The cubic root of 820645411 is about 936.2356663480.

The spelling of 820645411 in words is "eight hundred twenty million, six hundred forty-five thousand, four hundred eleven".