8539972786 has 16 divisors (see below), whose sum is σ = 13180897368. Its totient is φ = 4147936000.

The previous prime is 8539972747. The next prime is 8539972787. The reversal of 8539972786 is 6872799358.

It can be written as a sum of positive squares in 4 ways, for example, as 8387079561 + 152893225 = 91581^2 + 12365^2 .

It is a super-2 number, since 2×8539972786² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8539972787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388135 + ... + 409546.

Almost surely, 2^8539972786 is an apocalyptic number.

8539972786 is a deficient number, since it is larger than the sum of its proper divisors (4640924582).

8539972786 is a wasteful number, since it uses less digits than its factorization.

8539972786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797837.

The product of its digits is 45722880, while the sum is 64.

The square root of 8539972786 is about 92411.9731744756. The cubic root of 8539972786 is about 2044.0216693219.

The spelling of 8539972786 in words is "eight billion, five hundred thirty-nine million, nine hundred seventy-two thousand, seven hundred eighty-six".