25681960 has 16 divisors (see below), whose sum is σ = 57784500. Its totient is φ = 10272768.

The previous prime is 25681927. The next prime is 25681969. The reversal of 25681960 is 6918652.

It can be written as a sum of positive squares in 2 ways, for example, as 25583364 + 98596 = 5058^2 + 314^2 .

It is not an unprimeable number, because it can be changed into a prime (25681969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320985 + ... + 321064.

Almost surely, 2^25681960 is an apocalyptic number.

25681960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25681960 is an abundant number, since it is smaller than the sum of its proper divisors (32102540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25681960 is a wasteful number, since it uses less digits than its factorization.

25681960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642060 (or 642056 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 25681960 is about 5067.7371676124. The cubic root of 25681960 is about 295.0367090199.

The spelling of 25681960 in words is "twenty-five million, six hundred eighty-one thousand, nine hundred sixty".