820898663 has 32 divisors (see below), whose sum is σ = 928972800. Its totient is φ = 720558720.

The previous prime is 820898653. The next prime is 820898699. The reversal of 820898663 is 366898028.

It is a cyclic number.

It is not a de Polignac number, because 820898663 - 2⁴ = 820898647 is a prime.

It is a super-2 number, since 2×820898663² = 1347749229830375138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820898623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5509313 + ... + 5509461.

It is an arithmetic number, because the mean of its divisors is an integer number (29030400).

Almost surely, 2^820898663 is an apocalyptic number.

820898663 is a deficient number, since it is larger than the sum of its proper divisors (108074137).

820898663 is a wasteful number, since it uses less digits than its factorization.

820898663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407.

The product of its (nonzero) digits is 995328, while the sum is 50.

The square root of 820898663 is about 28651.3291663755. The cubic root of 820898663 is about 936.3319641992.

The spelling of 820898663 in words is "eight hundred twenty million, eight hundred ninety-eight thousand, six hundred sixty-three".