25868640 has 96 divisors (see below), whose sum is σ = 93139200. Its totient is φ = 5912064.

The previous prime is 25868621. The next prime is 25868653. The reversal of 25868640 is 4686852.

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

It is a congruent number.

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, 490 + ... + 7209.

It is an arithmetic number, because the mean of its divisors is an integer number (970200).

Almost surely, 2^25868640 is an apocalyptic number.

25868640 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 25868640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46569600).

25868640 is an abundant number, since it is smaller than the sum of its proper divisors (67270560).

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

25868640 is a wasteful number, since it uses less digits than its factorization.

25868640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7724 (or 7716 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 25868640 is about 5086.1222950299. The cubic root of 25868640 is about 295.7498495283.

The spelling of 25868640 in words is "twenty-five million, eight hundred sixty-eight thousand, six hundred forty".