25578278208 has 84 divisors (see below), whose sum is σ = 83789174560. Its totient is φ = 7308078336.

The previous prime is 25578278191. The next prime is 25578278233. The reversal of 25578278208 is 80287287552.

25578278208 is a `hidden beast` number, since 2 + 557 + 8 + 2 + 7 + 82 + 0 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (84).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3167878 + ... + 3175941.

Almost surely, 2^25578278208 is an apocalyptic number.

25578278208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

25578278208 is an abundant number, since it is smaller than the sum of its proper divisors (58210896352).

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

25578278208 is a wasteful number, since it uses less digits than its factorization.

25578278208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6343844 (or 6343831 counting only the distinct ones).

The product of its (nonzero) digits is 5017600, while the sum is 54.

The spelling of 25578278208 in words is "twenty-five billion, five hundred seventy-eight million, two hundred seventy-eight thousand, two hundred eight".