2520521640 has 384 divisors, whose sum is σ = 10302888960. Its totient is φ = 520169472.

The previous prime is 2520521603. The next prime is 2520521683. The reversal of 2520521640 is 461250252.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1538902 + ... + 1540538.

It is an arithmetic number, because the mean of its divisors is an integer number (26830440).

Almost surely, 2^2520521640 is an apocalyptic number.

2520521640 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 2520521640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5151444480).

2520521640 is an abundant number, since it is smaller than the sum of its proper divisors (7782367320).

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

2520521640 is a wasteful number, since it uses less digits than its factorization.

2520521640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721 (or 1714 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 2520521640 is about 50204.7969819618. The cubic root of 2520521640 is about 1360.9123131838.

Adding to 2520521640 its reverse (461250252), we get a palindrome (2981771892).

The spelling of 2520521640 in words is "two billion, five hundred twenty million, five hundred twenty-one thousand, six hundred forty".