2685816 has 72 divisors (see below), whose sum is σ = 8428680. Its totient is φ = 756864.

The previous prime is 2685803. The next prime is 2685817. The reversal of 2685816 is 6185862.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2685817) 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 17 ways as a sum of consecutive naturals, for example, 36756 + ... + 36828.

It is an arithmetic number, because the mean of its divisors is an integer number (117065).

2^2685816 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 2685816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4214340).

2685816 is an abundant number, since it is smaller than the sum of its proper divisors (5742864).

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

2685816 is a wasteful number, since it uses less digits than its factorization.

2685816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 85 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2685816 is about 1638.8459354070. The cubic root of 2685816 is about 139.0033986368.

It can be divided in two parts, 268 and 5816, that added together give a square (6084 = 78²).

The spelling of 2685816 in words is "two million, six hundred eighty-five thousand, eight hundred sixteen".