2709640 has 16 divisors (see below), whose sum is σ = 6096780. Its totient is φ = 1083840.

The previous prime is 2709611. The next prime is 2709643. The reversal of 2709640 is 469072.

It can be written as a sum of positive squares in 2 ways, for example, as 2709316 + 324 = 1646^2 + 18^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2709599 and 2709608.

It is not an unprimeable number, because it can be changed into a prime (2709643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33831 + ... + 33910.

2^2709640 is an apocalyptic number.

2709640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2709640 is an abundant number, since it is smaller than the sum of its proper divisors (3387140).

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

2709640 is a wasteful number, since it uses less digits than its factorization.

2709640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67752 (or 67748 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 2709640 is about 1646.0984174708. The cubic root of 2709640 is about 139.4131900816.

The spelling of 2709640 in words is "two million, seven hundred nine thousand, six hundred forty".