25663242 has 16 divisors (see below), whose sum is σ = 55992672. Its totient is φ = 7776720.

The previous prime is 25663241. The next prime is 25663247. The reversal of 25663242 is 24236652.

It is not an unprimeable number, because it can be changed into a prime (25663241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194353 + ... + 194484.

It is an arithmetic number, because the mean of its divisors is an integer number (3499542).

Almost surely, 2^25663242 is an apocalyptic number.

25663242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

25663242 is an abundant number, since it is smaller than the sum of its proper divisors (30329430).

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

25663242 is a wasteful number, since it uses less digits than its factorization.

25663242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388853.

The product of its digits is 17280, while the sum is 30.

The square root of 25663242 is about 5065.8900501294. The cubic root of 25663242 is about 294.9650135661.

Adding to 25663242 its reverse (24236652), we get a palindrome (49899894).

The spelling of 25663242 in words is "twenty-five million, six hundred sixty-three thousand, two hundred forty-two".