2558778756 has 24 divisors (see below), whose sum is σ = 5989567584. Its totient is φ = 850200000.

The previous prime is 2558778737. The next prime is 2558778763. The reversal of 2558778756 is 6578778552.

It is a self number, because there is not a number n which added to its sum of digits gives 2558778756.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336870 + ... + 344381.

It is an arithmetic number, because the mean of its divisors is an integer number (249565316).

Almost surely, 2^2558778756 is an apocalyptic number.

It is an amenable number.

2558778756 is an abundant number, since it is smaller than the sum of its proper divisors (3430788828).

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

2558778756 is a wasteful number, since it uses less digits than its factorization.

2558778756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681571 (or 681569 counting only the distinct ones).

The product of its digits is 32928000, while the sum is 60.

The square root of 2558778756 is about 50584.3726461048. The cubic root of 2558778756 is about 1367.7631917136.

The spelling of 2558778756 in words is "two billion, five hundred fifty-eight million, seven hundred seventy-eight thousand, seven hundred fifty-six".