2581441920 has 512 divisors, whose sum is σ = 9713664000. Its totient is φ = 646963200.

The previous prime is 2581441913. The next prime is 2581441963. The reversal of 2581441920 is 291441852.

2581441920 is a `hidden beast` number, since 2 + 581 + 44 + 19 + 20 = 666.

2581441920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 32676441 + ... + 32676519.

It is an arithmetic number, because the mean of its divisors is an integer number (18972000).

Almost surely, 2^2581441920 is an apocalyptic number.

2581441920 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 2581441920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4856832000).

2581441920 is an abundant number, since it is smaller than the sum of its proper divisors (7132222080).

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

2581441920 is a wasteful number, since it uses less digits than its factorization.

2581441920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 2581441920 is about 50807.8923003110. The cubic root of 2581441920 is about 1371.7894318251.

The spelling of 2581441920 in words is "two billion, five hundred eighty-one million, four hundred forty-one thousand, nine hundred twenty".