2581247800 has 48 divisors (see below), whose sum is σ = 6026623200. Its totient is φ = 1028160000.

The previous prime is 2581247791. The next prime is 2581247803. The reversal of 2581247800 is 87421852.

It is a self number, because there is not a number n which added to its sum of digits gives 2581247800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581247803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20800 + ... + 74800.

It is an arithmetic number, because the mean of its divisors is an integer number (125554650).

Almost surely, 2^2581247800 is an apocalyptic number.

2581247800 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 2581247800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3013311600).

2581247800 is an abundant number, since it is smaller than the sum of its proper divisors (3445375400).

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

2581247800 is a wasteful number, since it uses less digits than its factorization.

2581247800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54256 (or 54247 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 2581247800 is about 50805.9819312647. The cubic root of 2581247800 is about 1371.7550455599.

The spelling of 2581247800 in words is "two billion, five hundred eighty-one million, two hundred forty-seven thousand, eight hundred".