1871081856 has 480 divisors, whose sum is σ = 6753542400. Its totient is φ = 512096256.

The previous prime is 1871081851. The next prime is 1871081869. The reversal of 1871081856 is 6581801781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1871081851) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 14732865 + ... + 14732991.

It is an arithmetic number, because the mean of its divisors is an integer number (14069880).

Almost surely, 2^1871081856 is an apocalyptic number.

1871081856 is a gapful number since it is divisible by the number (16) 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 1871081856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3376771200).

1871081856 is an abundant number, since it is smaller than the sum of its proper divisors (4882460544).

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

1871081856 is a wasteful number, since it uses less digits than its factorization.

1871081856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 45.

The square root of 1871081856 is about 43256.0036989087. The cubic root of 1871081856 is about 1232.2465071477.

The spelling of 1871081856 in words is "one billion, eight hundred seventy-one million, eighty-one thousand, eight hundred fifty-six".