8489978784 has 72 divisors (see below), whose sum is σ = 27592437600. Its totient is φ = 2425707648.

The previous prime is 8489978779. The next prime is 8489978797. The reversal of 8489978784 is 4878799848.

8489978784 is a `hidden beast` number, since 8 + 489 + 9 + 78 + 78 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2103634 + ... + 2107665.

It is an arithmetic number, because the mean of its divisors is an integer number (383228300).

Almost surely, 2^8489978784 is an apocalyptic number.

8489978784 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

8489978784 is an abundant number, since it is smaller than the sum of its proper divisors (19102458816).

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

8489978784 is a wasteful number, since it uses less digits than its factorization.

8489978784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4211322 (or 4211311 counting only the distinct ones).

The product of its digits is 260112384, while the sum is 72.

The square root of 8489978784 is about 92141.0808705867. The cubic root of 8489978784 is about 2040.0252130679.

The spelling of 8489978784 in words is "eight billion, four hundred eighty-nine million, nine hundred seventy-eight thousand, seven hundred eighty-four".