25809696 has 72 divisors (see below), whose sum is σ = 80078544. Its totient is φ = 7820160.

The previous prime is 25809691. The next prime is 25809713. The reversal of 25809696 is 69690852.

25809696 is a `hidden beast` number, since 2 + 580 + 9 + 69 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×25809696² = 1332280815224832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25809691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 906 + ... + 7241.

It is an arithmetic number, because the mean of its divisors is an integer number (1112202).

Almost surely, 2^25809696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25809696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40039272).

25809696 is an abundant number, since it is smaller than the sum of its proper divisors (54268848).

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

25809696 is a wasteful number, since it uses less digits than its factorization.

25809696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8174 (or 8163 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 25809696 is about 5080.3243990911. The cubic root of 25809696 is about 295.5250479081.

The spelling of 25809696 in words is "twenty-five million, eight hundred nine thousand, six hundred ninety-six".