2585781400 has 24 divisors (see below), whose sum is σ = 6011942220. Its totient is φ = 1034312480.

The previous prime is 2585781361. The next prime is 2585781403. The reversal of 2585781400 is 41875852.

2585781400 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 (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2585781403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6464254 + ... + 6464653.

Almost surely, 2^2585781400 is an apocalyptic number.

2585781400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2585781400 is an abundant number, since it is smaller than the sum of its proper divisors (3426160820).

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

2585781400 is a wasteful number, since it uses less digits than its factorization.

2585781400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12928923 (or 12928914 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 40.

The square root of 2585781400 is about 50850.5791510775. The cubic root of 2585781400 is about 1372.5576743371.

The spelling of 2585781400 in words is "two billion, five hundred eighty-five million, seven hundred eighty-one thousand, four hundred".