6891037380 has 108 divisors (see below), whose sum is σ = 22204886340. Its totient is φ = 1729502208.

The previous prime is 6891037379. The next prime is 6891037421. The reversal of 6891037380 is 837301986.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 380484036 + 6510553344 = 19506^2 + 80688^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14215 + ... + 118254.

Almost surely, 2^6891037380 is an apocalyptic number.

6891037380 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 6891037380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11102443170).

6891037380 is an abundant number, since it is smaller than the sum of its proper divisors (15313848960).

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

6891037380 is a wasteful number, since it uses less digits than its factorization.

6891037380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132518 (or 132496 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 6891037380 is about 83012.2724661842. The cubic root of 6891037380 is about 1902.9536129644.

The spelling of 6891037380 in words is "six billion, eight hundred ninety-one million, thirty-seven thousand, three hundred eighty".