25657985 has 16 divisors (see below), whose sum is σ = 31491072. Its totient is φ = 20064000.

The previous prime is 25657969. The next prime is 25657997. The reversal of 25657985 is 58975652.

It is not a de Polignac number, because 25657985 - 2⁴ = 25657969 is a prime.

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, 63785 + ... + 64185.

It is an arithmetic number, because the mean of its divisors is an integer number (1968192).

Almost surely, 2^25657985 is an apocalyptic number.

It is an amenable number.

25657985 is a deficient number, since it is larger than the sum of its proper divisors (5833087).

25657985 is a wasteful number, since it uses less digits than its factorization.

25657985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664.

The product of its digits is 756000, while the sum is 47.

The square root of 25657985 is about 5065.3711611293. The cubic root of 25657985 is about 294.9448714374.

The spelling of 25657985 in words is "twenty-five million, six hundred fifty-seven thousand, nine hundred eighty-five".