25571642 has 4 divisors (see below), whose sum is σ = 38357466. Its totient is φ = 12785820.

The previous prime is 25571639. The next prime is 25571647. The reversal of 25571642 is 24617552.

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., 25210441 + 361201 = 5021^2 + 601^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25571599 and 25571608.

It is not an unprimeable number, because it can be changed into a prime (25571647) 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 as a sum of consecutive naturals, namely, 6392909 + ... + 6392912.

Almost surely, 2^25571642 is an apocalyptic number.

25571642 is a deficient number, since it is larger than the sum of its proper divisors (12785824).

25571642 is a wasteful number, since it uses less digits than its factorization.

25571642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12785823.

The product of its digits is 16800, while the sum is 32.

The square root of 25571642 is about 5056.8411088346. The cubic root of 25571642 is about 294.6136549281.

The spelling of 25571642 in words is "twenty-five million, five hundred seventy-one thousand, six hundred forty-two".