25806536 has 48 divisors (see below), whose sum is σ = 57633840. Its totient is φ = 10795680.

The previous prime is 25806533. The next prime is 25806551. The reversal of 25806536 is 63560852.

It is a junction number, because it is equal to n+sod(n) for n = 25806496 and 25806505.

It is not an unprimeable number, because it can be changed into a prime (25806533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16091 + ... + 17621.

It is an arithmetic number, because the mean of its divisors is an integer number (1200705).

Almost surely, 2^25806536 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 25806536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28816920).

25806536 is an abundant number, since it is smaller than the sum of its proper divisors (31827304).

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

25806536 is a wasteful number, since it uses less digits than its factorization.

25806536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1594 (or 1583 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 25806536 is about 5080.0133858091. The cubic root of 25806536 is about 295.5129865848.

The spelling of 25806536 in words is "twenty-five million, eight hundred six thousand, five hundred thirty-six".