25844640 has 96 divisors (see below), whose sum is σ = 84986496. Its totient is φ = 6589440.

The previous prime is 25844633. The next prime is 25844659. The reversal of 25844640 is 4644852.

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

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9870 + ... + 12210.

It is an arithmetic number, because the mean of its divisors is an integer number (885276).

Almost surely, 2^25844640 is an apocalyptic number.

25844640 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 25844640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42493248).

25844640 is an abundant number, since it is smaller than the sum of its proper divisors (59141856).

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

25844640 is a wasteful number, since it uses less digits than its factorization.

25844640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382 (or 2374 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 25844640 is about 5083.7623862647. The cubic root of 25844640 is about 295.6583591806.

The spelling of 25844640 in words is "twenty-five million, eight hundred forty-four thousand, six hundred forty".