25821136 has 40 divisors (see below), whose sum is σ = 56469600. Its totient is φ = 11329920.

The previous prime is 25821127. The next prime is 25821137. The reversal of 25821136 is 63112852.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25821137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2575 + ... + 7633.

It is an arithmetic number, because the mean of its divisors is an integer number (1411740).

Almost surely, 2^25821136 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 25821136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28234800).

25821136 is an abundant number, since it is smaller than the sum of its proper divisors (30648464).

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

25821136 is a wasteful number, since it uses less digits than its factorization.

25821136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5107 (or 5101 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 25821136 is about 5081.4501867085. The cubic root of 25821136 is about 295.5687047204.

Adding to 25821136 its reverse (63112852), we get a palindrome (88933988).

The spelling of 25821136 in words is "twenty-five million, eight hundred twenty-one thousand, one hundred thirty-six".