2818021680 has 120 divisors (see below), whose sum is σ = 9476973792. Its totient is φ = 750431232.

The previous prime is 2818021667. The next prime is 2818021681. The reversal of 2818021680 is 861208182.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is not an unprimeable number, because it can be changed into a prime (2818021681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 614757 + ... + 619323.

Almost surely, 2^2818021680 is an apocalyptic number.

2818021680 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 2818021680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4738486896).

2818021680 is an abundant number, since it is smaller than the sum of its proper divisors (6658952112).

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

2818021680 is a wasteful number, since it uses less digits than its factorization.

2818021680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5443 (or 5434 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 2818021680 is about 53085.0419609893. The cubic root of 2818021680 is about 1412.4771905367.

The spelling of 2818021680 in words is "two billion, eight hundred eighteen million, twenty-one thousand, six hundred eighty".