2585781420 has 24 divisors (see below), whose sum is σ = 7240188144. Its totient is φ = 689541696.

The previous prime is 2585781409. The next prime is 2585781431. The reversal of 2585781420 is 241875852.

It is an interprime number because it is at equal distance from previous prime (2585781409) and next prime (2585781431).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21548119 + ... + 21548238.

It is an arithmetic number, because the mean of its divisors is an integer number (301674506).

Almost surely, 2^2585781420 is an apocalyptic number.

2585781420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2585781420 is an abundant number, since it is smaller than the sum of its proper divisors (4654406724).

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

2585781420 is a wasteful number, since it uses less digits than its factorization.

2585781420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43096369 (or 43096367 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 42.

The square root of 2585781420 is about 50850.5793477321. The cubic root of 2585781420 is about 1372.5576778758.

The spelling of 2585781420 in words is "two billion, five hundred eighty-five million, seven hundred eighty-one thousand, four hundred twenty".