25673639 has 4 divisors (see below), whose sum is σ = 25741056. Its totient is φ = 25606224.

The previous prime is 25673633. The next prime is 25673651. The reversal of 25673639 is 93637652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25673639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25673596 and 25673605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25673633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33134 + ... + 33899.

It is an arithmetic number, because the mean of its divisors is an integer number (6435264).

Almost surely, 2^25673639 is an apocalyptic number.

25673639 is a deficient number, since it is larger than the sum of its proper divisors (67417).

25673639 is an equidigital number, since it uses as much as digits as its factorization.

25673639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67416.

The product of its digits is 204120, while the sum is 41.

The square root of 25673639 is about 5066.9161232450. The cubic root of 25673639 is about 295.0048414412.

The spelling of 25673639 in words is "twenty-five million, six hundred seventy-three thousand, six hundred thirty-nine".