25405668 has 18 divisors (see below), whose sum is σ = 64219974. Its totient is φ = 8468544.

The previous prime is 25405661. The next prime is 25405693. The reversal of 25405668 is 86650452.

25405668 is a `hidden beast` number, since 2 + 540 + 56 + 68 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19873764 + 5531904 = 4458^2 + 2352^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 705713 = 25405668 / (2 + 5 + 4 + 0 + 5 + 6 + 6 + 8).

It is not an unprimeable number, because it can be changed into a prime (25405661) 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 5 ways as a sum of consecutive naturals, for example, 352821 + ... + 352892.

Almost surely, 2^25405668 is an apocalyptic number.

It is an amenable number.

25405668 is an abundant number, since it is smaller than the sum of its proper divisors (38814306).

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

25405668 is a wasteful number, since it uses less digits than its factorization.

25405668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705723 (or 705718 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 25405668 is about 5040.4035552721. The cubic root of 25405668 is about 293.9748694332.

The spelling of 25405668 in words is "twenty-five million, four hundred five thousand, six hundred sixty-eight".