2640352240 has 40 divisors (see below), whose sum is σ = 6176510928. Its totient is φ = 1049656320.

The previous prime is 2640352217. The next prime is 2640352303. The reversal of 2640352240 is 422530462.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 2640352199 and 2640352208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88201 + ... + 114280.

Almost surely, 2^2640352240 is an apocalyptic number.

2640352240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640352240 is an abundant number, since it is smaller than the sum of its proper divisors (3536158688).

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

2640352240 is a wasteful number, since it uses less digits than its factorization.

2640352240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202657 (or 202651 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 2640352240 is about 51384.3579311837. The cubic root of 2640352240 is about 1382.1461111343.

The spelling of 2640352240 in words is "two billion, six hundred forty million, three hundred fifty-two thousand, two hundred forty".