8065821820 has 48 divisors (see below), whose sum is σ = 19381602240. Its totient is φ = 2762049024.

The previous prime is 8065821817. The next prime is 8065821871. The reversal of 8065821820 is 281285608.

It is a happy number.

It is a super-2 number, since 2×8065821820² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81312 + ... + 150808.

It is an arithmetic number, because the mean of its divisors is an integer number (403783380).

Almost surely, 2^8065821820 is an apocalyptic number.

It is an amenable number.

8065821820 is an abundant number, since it is smaller than the sum of its proper divisors (11315780420).

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

8065821820 is a wasteful number, since it uses less digits than its factorization.

8065821820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70342 (or 70340 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 8065821820 is about 89809.9204987957. The cubic root of 8065821820 is about 2005.4701766103.

The spelling of 8065821820 in words is "eight billion, sixty-five million, eight hundred twenty-one thousand, eight hundred twenty".