4991309856 has 288 divisors, whose sum is σ = 16478017920. Its totient is φ = 1458445824.

The previous prime is 4991309759. The next prime is 4991309887. The reversal of 4991309856 is 6589031994.

4991309856 is a `hidden beast` number, since 499 + 13 + 0 + 98 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35908635 + ... + 35908773.

It is an arithmetic number, because the mean of its divisors is an integer number (57215340).

Almost surely, 2^4991309856 is an apocalyptic number.

4991309856 is a gapful number since it is divisible by the number (46) 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 4991309856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8239008960).

4991309856 is an abundant number, since it is smaller than the sum of its proper divisors (11486708064).

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

4991309856 is a wasteful number, since it uses less digits than its factorization.

4991309856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The square root of 4991309856 is about 70649.2027980500. The cubic root of 4991309856 is about 1708.9847097077.

The spelling of 4991309856 in words is "four billion, nine hundred ninety-one million, three hundred nine thousand, eight hundred fifty-six".