8469947988 has 36 divisors (see below), whose sum is σ = 22148429940. Its totient is φ = 2725959936.

The previous prime is 8469947963. The next prime is 8469947989. The reversal of 8469947988 is 8897499648.

8469947988 is a `hidden beast` number, since 8 + 469 + 94 + 79 + 8 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4879301904 + 3590646084 = 69852^2 + 59922^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8469947989) 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 11 ways as a sum of consecutive naturals, for example, 4055445 + ... + 4057532.

It is an arithmetic number, because the mean of its divisors is an integer number (615234165).

Almost surely, 2^8469947988 is an apocalyptic number.

It is an amenable number.

8469947988 is an abundant number, since it is smaller than the sum of its proper divisors (13678481952).

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

8469947988 is a wasteful number, since it uses less digits than its factorization.

8469947988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8113016 (or 8113011 counting only the distinct ones).

The product of its digits is 250822656, while the sum is 72.

The square root of 8469947988 is about 92032.3203445398. The cubic root of 8469947988 is about 2038.4195746630.

The spelling of 8469947988 in words is "eight billion, four hundred sixty-nine million, nine hundred forty-seven thousand, nine hundred eighty-eight".