6689749824 has 280 divisors, whose sum is σ = 21789176640. Its totient is φ = 2020018176.

The previous prime is 6689749823. The next prime is 6689749877. The reversal of 6689749824 is 4289479866.

6689749824 is a `hidden beast` number, since 66 + 89 + 7 + 498 + 2 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689749823) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2263932 + ... + 2266884.

It is an arithmetic number, because the mean of its divisors is an integer number (77818488).

Almost surely, 2^6689749824 is an apocalyptic number.

6689749824 is a gapful number since it is divisible by the number (64) 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 6689749824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10894588320).

6689749824 is an abundant number, since it is smaller than the sum of its proper divisors (15099426816).

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

6689749824 is a wasteful number, since it uses less digits than its factorization.

6689749824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3019 (or 3000 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 63.

The square root of 6689749824 is about 81790.8908375499. The cubic root of 6689749824 is about 1884.2417637734.

The spelling of 6689749824 in words is "six billion, six hundred eighty-nine million, seven hundred forty-nine thousand, eight hundred twenty-four".