2685629820 has 144 divisors (see below), whose sum is σ = 7943491584. Its totient is φ = 677635200.

The previous prime is 2685629819. The next prime is 2685629827. The reversal of 2685629820 is 289265862.

It is a self number, because there is not a number n which added to its sum of digits gives 2685629820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2685629827) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2709525 + ... + 2710515.

It is an arithmetic number, because the mean of its divisors is an integer number (55163136).

Almost surely, 2^2685629820 is an apocalyptic number.

2685629820 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 2685629820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3971745792).

2685629820 is an abundant number, since it is smaller than the sum of its proper divisors (5257861764).

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

2685629820 is a wasteful number, since it uses less digits than its factorization.

2685629820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The square root of 2685629820 is about 51823.0626265951. The cubic root of 2685629820 is about 1390.0018667056.

The spelling of 2685629820 in words is "two billion, six hundred eighty-five million, six hundred twenty-nine thousand, eight hundred twenty".