25071840 has 144 divisors (see below), whose sum is σ = 89395488. Its totient is φ = 6386688.

The previous prime is 25071833. The next prime is 25071841. The reversal of 25071840 is 4817052.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25071841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32742 + ... + 33498.

It is an arithmetic number, because the mean of its divisors is an integer number (620802).

Almost surely, 2^25071840 is an apocalyptic number.

25071840 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 25071840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44697744).

25071840 is an abundant number, since it is smaller than the sum of its proper divisors (64323648).

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

25071840 is a wasteful number, since it uses less digits than its factorization.

25071840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 790 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 25071840 is about 5007.1788464164. The cubic root of 25071840 is about 292.6815878801.

Adding to 25071840 its reverse (4817052), we get a palindrome (29888892).

The spelling of 25071840 in words is "twenty-five million, seventy-one thousand, eight hundred forty".