8128571284 has 12 divisors (see below), whose sum is σ = 15061764564. Its totient is φ = 3825209984.

The previous prime is 8128571281. The next prime is 8128571293. The reversal of 8128571284 is 4821758218.

It can be written as a sum of positive squares in 2 ways, for example, as 2428321284 + 5700250000 = 49278^2 + 75500^2 .

It is a super-2 number, since 2×8128571284² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8128571281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59768839 + ... + 59768974.

It is an arithmetic number, because the mean of its divisors is an integer number (1255147047).

Almost surely, 2^8128571284 is an apocalyptic number.

It is an amenable number.

8128571284 is a deficient number, since it is larger than the sum of its proper divisors (6933193280).

8128571284 is a wasteful number, since it uses less digits than its factorization.

8128571284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119537834 (or 119537832 counting only the distinct ones).

The product of its digits is 286720, while the sum is 46.

The square root of 8128571284 is about 90158.5896296077. The cubic root of 8128571284 is about 2010.6573828897.

The spelling of 8128571284 in words is "eight billion, one hundred twenty-eight million, five hundred seventy-one thousand, two hundred eighty-four".