1861856064 has 112 divisors (see below), whose sum is σ = 5484205440. Its totient is φ = 619407360.

The previous prime is 1861856047. The next prime is 1861856089. The reversal of 1861856064 is 4606581681.

1861856064 is a `hidden beast` number, since 1 + 86 + 1 + 8 + 560 + 6 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1521757 + ... + 1522979.

It is an arithmetic number, because the mean of its divisors is an integer number (48966120).

Almost surely, 2^1861856064 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 1861856064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2742102720).

1861856064 is an abundant number, since it is smaller than the sum of its proper divisors (3622349376).

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

1861856064 is a wasteful number, since it uses less digits than its factorization.

1861856064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125 (or 2109 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 1861856064 is about 43149.2301669450. The cubic root of 1861856064 is about 1230.2178793091.

The spelling of 1861856064 in words is "one billion, eight hundred sixty-one million, eight hundred fifty-six thousand, sixty-four".