6478989136 has 20 divisors (see below), whose sum is σ = 13291456212. Its totient is φ = 3048935936.

The previous prime is 6478989133. The next prime is 6478989161. The reversal of 6478989136 is 6319898746.

It can be written as a sum of positive squares in 2 ways, for example, as 4719690000 + 1759299136 = 68700^2 + 41944^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6478989133) 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, 11909635 + ... + 11910178.

Almost surely, 2^6478989136 is an apocalyptic number.

It is an amenable number.

6478989136 is an abundant number, since it is smaller than the sum of its proper divisors (6812467076).

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

6478989136 is a wasteful number, since it uses less digits than its factorization.

6478989136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23819838 (or 23819832 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 61.

The square root of 6478989136 is about 80492.1681656048. The cubic root of 6478989136 is about 1864.2425544111.

The spelling of 6478989136 in words is "six billion, four hundred seventy-eight million, nine hundred eighty-nine thousand, one hundred thirty-six".