4991843856 has 80 divisors (see below), whose sum is σ = 13890103040. Its totient is φ = 1539699840.

The previous prime is 4991843833. The next prime is 4991843861. The reversal of 4991843856 is 6583481994.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 4991843796 and 4991843805.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24430 + ... + 102861.

It is an arithmetic number, because the mean of its divisors is an integer number (173626288).

Almost surely, 2^4991843856 is an apocalyptic number.

It is an amenable number.

4991843856 is an abundant number, since it is smaller than the sum of its proper divisors (8898259184).

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

4991843856 is a wasteful number, since it uses less digits than its factorization.

4991843856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127364 (or 127358 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 57.

The square root of 4991843856 is about 70652.9819328243. The cubic root of 4991843856 is about 1709.0456533156.

The spelling of 4991843856 in words is "four billion, nine hundred ninety-one million, eight hundred forty-three thousand, eight hundred fifty-six".