2585648778 has 32 divisors (see below), whose sum is σ = 5272610112. Its totient is φ = 845020800.

The previous prime is 2585648771. The next prime is 2585648827. The reversal of 2585648778 is 8778465852.

It is not an unprimeable number, because it can be changed into a prime (2585648771) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 774573 + ... + 777903.

It is an arithmetic number, because the mean of its divisors is an integer number (164769066).

Almost surely, 2^2585648778 is an apocalyptic number.

2585648778 is an abundant number, since it is smaller than the sum of its proper divisors (2686961334).

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

2585648778 is a wasteful number, since it uses less digits than its factorization.

2585648778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5830.

The product of its digits is 30105600, while the sum is 60.

The square root of 2585648778 is about 50849.2750980778. The cubic root of 2585648778 is about 1372.5342082575.

The spelling of 2585648778 in words is "two billion, five hundred eighty-five million, six hundred forty-eight thousand, seven hundred seventy-eight".