25921280 has 144 divisors (see below), whose sum is σ = 77704704. Its totient is φ = 8048640.

The previous prime is 25921271. The next prime is 25921309. The reversal of 25921280 is 8212952.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98429 + ... + 98691.

It is an arithmetic number, because the mean of its divisors is an integer number (539616).

Almost surely, 2^25921280 is an apocalyptic number.

25921280 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 25921280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38852352).

25921280 is an abundant number, since it is smaller than the sum of its proper divisors (51783424).

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

25921280 is a wasteful number, since it uses less digits than its factorization.

25921280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 25921280 is about 5091.2945308634. The cubic root of 25921280 is about 295.9503203695.

The spelling of 25921280 in words is "twenty-five million, nine hundred twenty-one thousand, two hundred eighty".