25105840 has 80 divisors (see below), whose sum is σ = 62496000. Its totient is φ = 9351936.

The previous prime is 25105837. The next prime is 25105901. The reversal of 25105840 is 4850152.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126061 + ... + 126259.

It is an arithmetic number, because the mean of its divisors is an integer number (781200).

Almost surely, 2^25105840 is an apocalyptic number.

25105840 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 25105840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31248000).

25105840 is an abundant number, since it is smaller than the sum of its proper divisors (37390160).

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

25105840 is a wasteful number, since it uses less digits than its factorization.

25105840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 25105840 is about 5010.5728215445. The cubic root of 25105840 is about 292.8138302564.

Adding to 25105840 its reverse (4850152), we get a palindrome (29955992).

The spelling of 25105840 in words is "twenty-five million, one hundred five thousand, eight hundred forty".