25705641 has 16 divisors (see below), whose sum is σ = 37001664. Its totient is φ = 15779904.

The previous prime is 25705637. The next prime is 25705643. The reversal of 25705641 is 14650752.

It is not a de Polignac number, because 25705641 - 2² = 25705637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25705599 and 25705608.

It is not an unprimeable number, because it can be changed into a prime (25705643) by changing a digit.

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, 30670 + ... + 31496.

It is an arithmetic number, because the mean of its divisors is an integer number (2312604).

Almost surely, 2^25705641 is an apocalyptic number.

It is an amenable number.

25705641 is a deficient number, since it is larger than the sum of its proper divisors (11296023).

25705641 is a wasteful number, since it uses less digits than its factorization.

25705641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 25705641 is about 5070.0730763964. The cubic root of 25705641 is about 295.1273643273.

The spelling of 25705641 in words is "twenty-five million, seven hundred five thousand, six hundred forty-one".