2581399320 has 128 divisors (see below), whose sum is σ = 7830432000. Its totient is φ = 680762880.

The previous prime is 2581399307. The next prime is 2581399361. The reversal of 2581399320 is 239931852.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6810891 + ... + 6811269.

It is an arithmetic number, because the mean of its divisors is an integer number (61175250).

Almost surely, 2^2581399320 is an apocalyptic number.

2581399320 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 2581399320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3915216000).

2581399320 is an abundant number, since it is smaller than the sum of its proper divisors (5249032680).

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

2581399320 is a wasteful number, since it uses less digits than its factorization.

2581399320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873 (or 869 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 2581399320 is about 50807.4730723739. The cubic root of 2581399320 is about 1371.7818858420.

The spelling of 2581399320 in words is "two billion, five hundred eighty-one million, three hundred ninety-nine thousand, three hundred twenty".