2581003820 has 24 divisors (see below), whose sum is σ = 5566599024. Its totient is φ = 1004498496.

The previous prime is 2581003787. The next prime is 2581003829. The reversal of 2581003820 is 283001852.

It is not an unprimeable number, because it can be changed into a prime (2581003829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1743182 + ... + 1744661.

It is an arithmetic number, because the mean of its divisors is an integer number (231941626).

Almost surely, 2^2581003820 is an apocalyptic number.

2581003820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2581003820 is an abundant number, since it is smaller than the sum of its proper divisors (2985595204).

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

2581003820 is a wasteful number, since it uses less digits than its factorization.

2581003820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3487889 (or 3487887 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 2581003820 is about 50803.5807793112. The cubic root of 2581003820 is about 1371.7118246880.

The spelling of 2581003820 in words is "two billion, five hundred eighty-one million, three thousand, eight hundred twenty".