8121641764 has 12 divisors (see below), whose sum is σ = 14671353088.
Its totient is φ = 3929826600.
The previous prime is 8121641753. The next prime is 8121641771. The reversal of 8121641764 is 4671461218.
It is a super-2 number, since 2×81216417642 (a number of 21 digits) contains 22 as substring.
It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.
It is an unprimeable number.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32748432 + ... + 32748679.
Almost surely, 28121641764 is an apocalyptic number.
It is an amenable number.
8121641764 is a deficient number, since it is larger than the sum of its proper divisors (6549711324).
8121641764 is a wasteful number, since it uses less digits than its factorization.
8121641764 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 65497146 (or 65497144 counting only the distinct ones).
The product of its digits is 64512, while the sum is 40.
The square root of 8121641764 is about 90120.1518196679.
The cubic root of 8121641764 is about 2010.0858658235.
The spelling of 8121641764 in words is "eight billion, one hundred twenty-one million, six hundred forty-one thousand, seven hundred sixty-four".