2868840 has 96 divisors (see below), whose sum is σ = 10057320. Its totient is φ = 705024.

The previous prime is 2868823. The next prime is 2868851. The reversal of 2868840 is 488682.

2868840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 777924 + 2090916 = 882^2 + 1446^2 .

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

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2868795 and 2868804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4374 + ... + 4986.

2^2868840 is an apocalyptic number.

2868840 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 2868840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5028660).

2868840 is an abundant number, since it is smaller than the sum of its proper divisors (7188480).

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

2868840 is a wasteful number, since it uses less digits than its factorization.

2868840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 2868840 is about 1693.7650368336. The cubic root of 2868840 is about 142.0917214733.

The spelling of 2868840 in words is "two million, eight hundred sixty-eight thousand, eight hundred forty".