8063621820 has 96 divisors (see below), whose sum is σ = 25113291840. Its totient is φ = 2148030720.

The previous prime is 8063621807. The next prime is 8063621939. The reversal of 8063621820 is 281263608.

8063621820 is a `hidden beast` number, since 8 + 0 + 6 + 3 + 621 + 8 + 20 = 666.

It is a super-2 number, since 2×8063621820² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 539650 + ... + 554390.

It is an arithmetic number, because the mean of its divisors is an integer number (261596790).

Almost surely, 2^8063621820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8063621820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12556645920).

8063621820 is an abundant number, since it is smaller than the sum of its proper divisors (17049670020).

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

8063621820 is a wasteful number, since it uses less digits than its factorization.

8063621820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15772 (or 15764 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 8063621820 is about 89797.6715733766. The cubic root of 8063621820 is about 2005.2878254632.

The spelling of 8063621820 in words is "eight billion, sixty-three million, six hundred twenty-one thousand, eight hundred twenty".