25673987 has 4 divisors (see below), whose sum is σ = 25716216. Its totient is φ = 25631760.

The previous prime is 25673953. The next prime is 25673993. The reversal of 25673987 is 78937652.

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

It is a cyclic number.

It is not a de Polignac number, because 25673987 - 2¹⁸ = 25411843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25673917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20189 + ... + 21422.

It is an arithmetic number, because the mean of its divisors is an integer number (6429054).

Almost surely, 2^25673987 is an apocalyptic number.

25673987 is a deficient number, since it is larger than the sum of its proper divisors (42229).

25673987 is an equidigital number, since it uses as much as digits as its factorization.

25673987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42228.

The product of its digits is 635040, while the sum is 47.

The square root of 25673987 is about 5066.9504635431. The cubic root of 25673987 is about 295.0061743417.

The spelling of 25673987 in words is "twenty-five million, six hundred seventy-three thousand, nine hundred eighty-seven".