25881645 has 16 divisors (see below), whose sum is σ = 41878080. Its totient is φ = 13647744.

The previous prime is 25881643. The next prime is 25881671. The reversal of 25881645 is 54618852.

It is not a de Polignac number, because 25881645 - 2¹ = 25881643 is a prime.

It is a super-3 number, since 3×25881645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25881643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8359 + ... + 11028.

It is an arithmetic number, because the mean of its divisors is an integer number (2617380).

Almost surely, 2^25881645 is an apocalyptic number.

It is an amenable number.

25881645 is a deficient number, since it is larger than the sum of its proper divisors (15996435).

25881645 is a wasteful number, since it uses less digits than its factorization.

25881645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19484.

The product of its digits is 76800, while the sum is 39.

The square root of 25881645 is about 5087.4006132798. The cubic root of 25881645 is about 295.7994022227.

The spelling of 25881645 in words is "twenty-five million, eight hundred eighty-one thousand, six hundred forty-five".