6891038856 has 288 divisors, whose sum is σ = 21340126080. Its totient is φ = 1995943680.

The previous prime is 6891038849. The next prime is 6891038863. The reversal of 6891038856 is 6588301986.

It is an interprime number because it is at equal distance from previous prime (6891038849) and next prime (6891038863).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 42276231 + ... + 42276393.

It is an arithmetic number, because the mean of its divisors is an integer number (74097660).

Almost surely, 2^6891038856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6891038856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10670063040).

6891038856 is an abundant number, since it is smaller than the sum of its proper divisors (14449087224).

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

6891038856 is a wasteful number, since it uses less digits than its factorization.

6891038856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The square root of 6891038856 is about 83012.2813564354. The cubic root of 6891038856 is about 1902.9537488298.

The spelling of 6891038856 in words is "six billion, eight hundred ninety-one million, thirty-eight thousand, eight hundred fifty-six".