2505540640 has 48 divisors (see below), whose sum is σ = 6230891520. Its totient is φ = 949466880.

The previous prime is 2505540629. The next prime is 2505540647. The reversal of 2505540640 is 460455052.

It is not an unprimeable number, because it can be changed into a prime (2505540647) 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, 409056 + ... + 415135.

It is an arithmetic number, because the mean of its divisors is an integer number (129810240).

Almost surely, 2^2505540640 is an apocalyptic number.

2505540640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2505540640 is an abundant number, since it is smaller than the sum of its proper divisors (3725350880).

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

2505540640 is a wasteful number, since it uses less digits than its factorization.

2505540640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824225 (or 824217 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 2505540640 is about 50055.3757352794. The cubic root of 2505540640 is about 1358.2107092268.

Adding to 2505540640 its reverse (460455052), we get a palindrome (2965995692).

The spelling of 2505540640 in words is "two billion, five hundred five million, five hundred forty thousand, six hundred forty".