25840836 has 144 divisors (see below), whose sum is σ = 82353600. Its totient is φ = 6967296.

The previous prime is 25840831. The next prime is 25840847. The reversal of 25840836 is 63804852.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 25840836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25840831) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 100420 + ... + 100676.

It is an arithmetic number, because the mean of its divisors is an integer number (571900).

Almost surely, 2^25840836 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 25840836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41176800).

25840836 is an abundant number, since it is smaller than the sum of its proper divisors (56512764).

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

25840836 is a wasteful number, since it uses less digits than its factorization.

25840836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 25840836 is about 5083.3882401406. The cubic root of 25840836 is about 295.6438527609.

The spelling of 25840836 in words is "twenty-five million, eight hundred forty thousand, eight hundred thirty-six".