2505821720 has 16 divisors (see below), whose sum is σ = 5638098960. Its totient is φ = 1002328672.

The previous prime is 2505821711. The next prime is 2505821753. The reversal of 2505821720 is 271285052.

It is a happy number.

2505821720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31322732 + ... + 31322811.

It is an arithmetic number, because the mean of its divisors is an integer number (352381185).

Almost surely, 2^2505821720 is an apocalyptic number.

2505821720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2505821720 is an abundant number, since it is smaller than the sum of its proper divisors (3132277240).

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

2505821720 is a wasteful number, since it uses less digits than its factorization.

2505821720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62645554 (or 62645550 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 2505821720 is about 50058.1833469813. The cubic root of 2505821720 is about 1358.2614968805.

The spelling of 2505821720 in words is "two billion, five hundred five million, eight hundred twenty-one thousand, seven hundred twenty".