25505280 has 240 divisors, whose sum is σ = 93837744. Its totient is φ = 6635520.

The previous prime is 25505279. The next prime is 25505299. The reversal of 25505280 is 8250552.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 12.

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 492 × 108 × 480.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 622060 + ... + 622100.

Almost surely, 2^25505280 is an apocalyptic number.

25505280 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 25505280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46918872).

25505280 is an abundant number, since it is smaller than the sum of its proper divisors (68332464).

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

25505280 is an frugal number, since it uses more digits than its factorization.

25505280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 25505280 is about 5050.2752400241. The cubic root of 25505280 is about 294.3585795539.

The spelling of 25505280 in words is "twenty-five million, five hundred five thousand, two hundred eighty".