25280398080 has 864 divisors, whose sum is σ = 109923899904. Its totient is φ = 5430509568.

The previous prime is 25280398021. The next prime is 25280398093. The reversal of 25280398080 is 8089308252.

25280398080 is a `hidden beast` number, since 252 + 8 + 0 + 398 + 0 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 37013419 + ... + 37014101.

It is an arithmetic number, because the mean of its divisors is an integer number (127226736).

Almost surely, 2^25280398080 is an apocalyptic number.

25280398080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25280398080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54961949952).

25280398080 is an abundant number, since it is smaller than the sum of its proper divisors (84643501824).

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

25280398080 is an equidigital number, since it uses as much as digits as its factorization.

25280398080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743 (or 717 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 25280398080 in words is "twenty-five billion, two hundred eighty million, three hundred ninety-eight thousand, eighty".