2745340640 has 144 divisors (see below), whose sum is σ = 7688302272. Its totient is φ = 923360256.

The previous prime is 2745340589. The next prime is 2745340649. The reversal of 2745340640 is 460435472.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 2745340640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2745340649) 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 23 ways as a sum of consecutive naturals, for example, 412217 + ... + 418823.

It is an arithmetic number, because the mean of its divisors is an integer number (53390988).

Almost surely, 2^2745340640 is an apocalyptic number.

2745340640 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 2745340640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3844151136).

2745340640 is an abundant number, since it is smaller than the sum of its proper divisors (4942961632).

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

2745340640 is a wasteful number, since it uses less digits than its factorization.

2745340640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6689 (or 6674 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 35.

The square root of 2745340640 is about 52395.9983204825. The cubic root of 2745340640 is about 1400.2279628786.

The spelling of 2745340640 in words is "two billion, seven hundred forty-five million, three hundred forty thousand, six hundred forty".