2645784680 has 128 divisors (see below), whose sum is σ = 7464960000. Its totient is φ = 819882240.

The previous prime is 2645784649. The next prime is 2645784709. The reversal of 2645784680 is 864875462.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 548921 + ... + 553719.

It is an arithmetic number, because the mean of its divisors is an integer number (58320000).

Almost surely, 2^2645784680 is an apocalyptic number.

2645784680 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 2645784680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3732480000).

2645784680 is an abundant number, since it is smaller than the sum of its proper divisors (4819175320).

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

2645784680 is a wasteful number, since it uses less digits than its factorization.

2645784680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5007 (or 5003 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 50.

The square root of 2645784680 is about 51437.1916029637. The cubic root of 2645784680 is about 1383.0933688696.

The spelling of 2645784680 in words is "two billion, six hundred forty-five million, seven hundred eighty-four thousand, six hundred eighty".