25680085 has 16 divisors (see below), whose sum is σ = 31538160. Its totient is φ = 20067840.

The previous prime is 25680079. The next prime is 25680089. The reversal of 25680085 is 58008652.

It can be written as a sum of positive squares in 8 ways, for example, as 17918289 + 7761796 = 4233^2 + 2786^2 .

It is not a de Polignac number, because 25680085 - 2¹⁵ = 25647317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25680085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25680089) 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, 81889 + ... + 82201.

It is an arithmetic number, because the mean of its divisors is an integer number (1971135).

Almost surely, 2^25680085 is an apocalyptic number.

It is an amenable number.

25680085 is a deficient number, since it is larger than the sum of its proper divisors (5858075).

25680085 is a wasteful number, since it uses less digits than its factorization.

25680085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 25680085 is about 5067.5521704271. The cubic root of 25680085 is about 295.0295287879.

The spelling of 25680085 in words is "twenty-five million, six hundred eighty thousand, eighty-five".