3081861720 has 192 divisors, whose sum is σ = 11756646720. Its totient is φ = 685366272.

The previous prime is 3081861689. The next prime is 3081861733. The reversal of 3081861720 is 271681803.

3081861720 is a `hidden beast` number, since 3 + 0 + 8 + 18 + 617 + 20 = 666.

It is a super-2 number, since 2×3081861720² = 18995743322402716800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 76714 + ... + 109766.

It is an arithmetic number, because the mean of its divisors is an integer number (61232535).

Almost surely, 2^3081861720 is an apocalyptic number.

3081861720 is a gapful number since it is divisible by the number (30) 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 3081861720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5878323360).

3081861720 is an abundant number, since it is smaller than the sum of its proper divisors (8674785000).

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

3081861720 is a wasteful number, since it uses less digits than its factorization.

3081861720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33114 (or 33107 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 3081861720 is about 55514.5181011238. The cubic root of 3081861720 is about 1455.2503625575.

The spelling of 3081861720 in words is "three billion, eighty-one million, eight hundred sixty-one thousand, seven hundred twenty".