8021860641 has 12 divisors (see below), whose sum is σ = 11589204900. Its totient is φ = 5346950400.

The previous prime is 8021860603. The next prime is 8021860661. The reversal of 8021860641 is 1460681208.

8021860641 is a `hidden beast` number, since 8 + 0 + 2 + 1 + 8 + 6 + 0 + 641 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6704170641 + 1317690000 = 81879^2 + 36300^2 .

It is not a de Polignac number, because 8021860641 - 2⁶ = 8021860577 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 8021860596 and 8021860605.

It is not an unprimeable number, because it can be changed into a prime (8021860661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24616 + ... + 129033.

It is an arithmetic number, because the mean of its divisors is an integer number (965767075).

Almost surely, 2^8021860641 is an apocalyptic number.

It is an amenable number.

8021860641 is a deficient number, since it is larger than the sum of its proper divisors (3567344259).

8021860641 is a wasteful number, since it uses less digits than its factorization.

8021860641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159456 (or 159453 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 8021860641 is about 89564.8404285968. The cubic root of 8021860641 is about 2001.8200632658.

The spelling of 8021860641 in words is "eight billion, twenty-one million, eight hundred sixty thousand, six hundred forty-one".