6989789880 has 192 divisors, whose sum is σ = 23901696000. Its totient is φ = 1769195520.

The previous prime is 6989789867. The next prime is 6989789897. The reversal of 6989789880 is 889879896.

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

It is a junction number, because it is equal to n+sod(n) for n = 6989789799 and 6989789808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 539721 + ... + 552519.

It is an arithmetic number, because the mean of its divisors is an integer number (124488000).

Almost surely, 2^6989789880 is an apocalyptic number.

6989789880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6989789880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11950848000).

6989789880 is an abundant number, since it is smaller than the sum of its proper divisors (16911906120).

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

6989789880 is a wasteful number, since it uses less digits than its factorization.

6989789880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12894 (or 12887 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 72.

The square root of 6989789880 is about 83604.9632497976. The cubic root of 6989789880 is about 1912.0006703603. Note that the first 3 decimals are identical.

The spelling of 6989789880 in words is "six billion, nine hundred eighty-nine million, seven hundred eighty-nine thousand, eight hundred eighty".