2640265240 has 128 divisors (see below), whose sum is σ = 6530284800. Its totient is φ = 956620800.

The previous prime is 2640265219. The next prime is 2640265247. The reversal of 2640265240 is 425620462.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640265247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2540641 + ... + 2541679.

It is an arithmetic number, because the mean of its divisors is an integer number (51017850).

Almost surely, 2^2640265240 is an apocalyptic number.

2640265240 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 2640265240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3265142400).

2640265240 is an abundant number, since it is smaller than the sum of its proper divisors (3890019560).

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

2640265240 is a wasteful number, since it uses less digits than its factorization.

2640265240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205 (or 1201 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 2640265240 is about 51383.5113630822. The cubic root of 2640265240 is about 1382.1309303274.

The spelling of 2640265240 in words is "two billion, six hundred forty million, two hundred sixty-five thousand, two hundred forty".