25478396856 has 128 divisors (see below), whose sum is σ = 77574700800. Its totient is φ = 7683984000.

The previous prime is 25478396843. The next prime is 25478396873. The reversal of 25478396856 is 65869387452.

It is a happy number.

25478396856 is a `hidden beast` number, since 2 + 547 + 8 + 3 + 9 + 6 + 85 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 25478396793 and 25478396802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 475926 + ... + 526746.

It is an arithmetic number, because the mean of its divisors is an integer number (606052350).

Almost surely, 2^25478396856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25478396856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38787350400).

25478396856 is an abundant number, since it is smaller than the sum of its proper divisors (52096303944).

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

25478396856 is a wasteful number, since it uses less digits than its factorization.

25478396856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51058 (or 51048 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 63.

The spelling of 25478396856 in words is "twenty-five billion, four hundred seventy-eight million, three hundred ninety-six thousand, eight hundred fifty-six".