25868642 has 4 divisors (see below), whose sum is σ = 38802966. Its totient is φ = 12934320.

The previous prime is 25868621. The next prime is 25868653. The reversal of 25868642 is 24686852.

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., 23049601 + 2819041 = 4801^2 + 1679^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25868642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6467159 + ... + 6467162.

Almost surely, 2^25868642 is an apocalyptic number.

25868642 is a deficient number, since it is larger than the sum of its proper divisors (12934324).

25868642 is a wasteful number, since it uses less digits than its factorization.

25868642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12934323.

The product of its digits is 184320, while the sum is 41.

The square root of 25868642 is about 5086.1224916433. The cubic root of 25868642 is about 295.7498571502.

The spelling of 25868642 in words is "twenty-five million, eight hundred sixty-eight thousand, six hundred forty-two".