6899105988 has 240 divisors, whose sum is σ = 19871636400. Its totient is φ = 2078244864.

The previous prime is 6899105947. The next prime is 6899106007. The reversal of 6899105988 is 8895019986.

It can be written as a sum of positive squares in 8 ways, for example, as 1423401984 + 5475704004 = 37728^2 + 73998^2 .

It is a super-2 number, since 2×6899105988² = 95195326867314912288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 19768038 + ... + 19768386.

It is an arithmetic number, because the mean of its divisors is an integer number (82798485).

Almost surely, 2^6899105988 is an apocalyptic number.

6899105988 is a gapful number since it is divisible by the number (68) 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 6899105988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9935818200).

6899105988 is an abundant number, since it is smaller than the sum of its proper divisors (12972530412).

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

6899105988 is a wasteful number, since it uses less digits than its factorization.

6899105988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 63.

The square root of 6899105988 is about 83060.8571349947. The cubic root of 6899105988 is about 1903.6960361602.

The spelling of 6899105988 in words is "six billion, eight hundred ninety-nine million, one hundred five thousand, nine hundred eighty-eight".