25280775808 has 32 divisors (see below), whose sum is σ = 51592447620. Its totient is φ = 12332083200.

The previous prime is 25280775787. The next prime is 25280775823. The reversal of 25280775808 is 80857708252.

It can be written as a sum of positive squares in 2 ways, for example, as 18843601984 + 6437173824 = 137272^2 + 80232^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2403363 + ... + 2413858.

Almost surely, 2^25280775808 is an apocalyptic number.

It is an amenable number.

25280775808 is an abundant number, since it is smaller than the sum of its proper divisors (26311671812).

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

25280775808 is an equidigital number, since it uses as much as digits as its factorization.

25280775808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4817276 (or 4817264 counting only the distinct ones).

The product of its (nonzero) digits is 2508800, while the sum is 52.

The spelling of 25280775808 in words is "twenty-five billion, two hundred eighty million, seven hundred seventy-five thousand, eight hundred eight".