2600640340 has 24 divisors (see below), whose sum is σ = 5489075592. Its totient is φ = 1034974080.

The previous prime is 2600640307. The next prime is 2600640347. The reversal of 2600640340 is 430460062.

It can be written as a sum of positive squares in 4 ways, for example, as 361836484 + 2238803856 = 19022^2 + 47316^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2600640347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326091 + ... + 333970.

It is an arithmetic number, because the mean of its divisors is an integer number (228711483).

Almost surely, 2^2600640340 is an apocalyptic number.

2600640340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2600640340 is an abundant number, since it is smaller than the sum of its proper divisors (2888435252).

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

2600640340 is a wasteful number, since it uses less digits than its factorization.

2600640340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660267 (or 660265 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 2600640340 is about 50996.4737996658. The cubic root of 2600640340 is about 1375.1817439104.

The spelling of 2600640340 in words is "two billion, six hundred million, six hundred forty thousand, three hundred forty".