25805280 has 96 divisors (see below), whose sum is σ = 83541024. Its totient is φ = 6690816.

The previous prime is 25805267. The next prime is 25805291. The reversal of 25805280 is 8250852.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 17034 + ... + 18486.

It is an arithmetic number, because the mean of its divisors is an integer number (870219).

Almost surely, 2^25805280 is an apocalyptic number.

25805280 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 25805280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41770512).

25805280 is an abundant number, since it is smaller than the sum of its proper divisors (57735744).

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

25805280 is a wasteful number, since it uses less digits than its factorization.

25805280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508 (or 1500 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 25805280 is about 5079.8897625834. The cubic root of 25805280 is about 295.5081923170.

The spelling of 25805280 in words is "twenty-five million, eight hundred five thousand, two hundred eighty".