2861859840 has 352 divisors, whose sum is σ = 10721694720. Its totient is φ = 637894656.

The previous prime is 2861859827. The next prime is 2861859853. The reversal of 2861859840 is 489581682.

It is an interprime number because it is at equal distance from previous prime (2861859827) and next prime (2861859853).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4623051 + ... + 4623669.

It is an arithmetic number, because the mean of its divisors is an integer number (30459360).

Almost surely, 2^2861859840 is an apocalyptic number.

2861859840 is a gapful number since it is divisible by the number (20) 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 2861859840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5360847360).

2861859840 is an abundant number, since it is smaller than the sum of its proper divisors (7859834880).

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

2861859840 is a wasteful number, since it uses less digits than its factorization.

2861859840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697 (or 679 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 51.

The square root of 2861859840 is about 53496.3535205905. The cubic root of 2861859840 is about 1419.7638700137.

The spelling of 2861859840 in words is "two billion, eight hundred sixty-one million, eight hundred fifty-nine thousand, eight hundred forty".