25881015 has 16 divisors (see below), whose sum is σ = 41728896. Its totient is φ = 13696800.

The previous prime is 25880989. The next prime is 25881017. The reversal of 25881015 is 51018852.

It is not a de Polignac number, because 25881015 - 2¹² = 25876919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25881017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4621 + ... + 8550.

It is an arithmetic number, because the mean of its divisors is an integer number (2608056).

Almost surely, 2^25881015 is an apocalyptic number.

25881015 is a deficient number, since it is larger than the sum of its proper divisors (15847881).

25881015 is a wasteful number, since it uses less digits than its factorization.

25881015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13310.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 25881015 is about 5087.3386952315. The cubic root of 25881015 is about 295.7970021288.

Adding to 25881015 its reverse (51018852), we get a palindrome (76899867).

The spelling of 25881015 in words is "twenty-five million, eight hundred eighty-one thousand, fifteen".