25988642 has 4 divisors (see below), whose sum is σ = 38982966. Its totient is φ = 12994320.

The previous prime is 25988639. The next prime is 25988647. The reversal of 25988642 is 24688952.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16982641 + 9006001 = 4121^2 + 3001^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25988593 and 25988602.

It is not an unprimeable number, because it can be changed into a prime (25988647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6497159 + ... + 6497162.

Almost surely, 2^25988642 is an apocalyptic number.

25988642 is a deficient number, since it is larger than the sum of its proper divisors (12994324).

25988642 is a wasteful number, since it uses less digits than its factorization.

25988642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12994323.

The product of its digits is 276480, while the sum is 44.

The square root of 25988642 is about 5097.9056484011. The cubic root of 25988642 is about 296.2064620571.

The spelling of 25988642 in words is "twenty-five million, nine hundred eighty-eight thousand, six hundred forty-two".