2861945216 has 32 divisors (see below), whose sum is σ = 6140114400. Its totient is φ = 1320897024.

The previous prime is 2861945213. The next prime is 2861945231. The reversal of 2861945216 is 6125491682.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2861945213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 858296 + ... + 861623.

It is an arithmetic number, because the mean of its divisors is an integer number (191878575).

Almost surely, 2^2861945216 is an apocalyptic number.

2861945216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2861945216 is an abundant number, since it is smaller than the sum of its proper divisors (3278169184).

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

2861945216 is a wasteful number, since it uses less digits than its factorization.

2861945216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719946 (or 1719934 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 2861945216 is about 53497.1514755692. The cubic root of 2861945216 is about 1419.7779881701. Note that the first 3 decimals are identical.

The spelling of 2861945216 in words is "two billion, eight hundred sixty-one million, nine hundred forty-five thousand, two hundred sixteen".