25655987 has 4 divisors (see below), whose sum is σ = 29321136. Its totient is φ = 21990840.

The previous prime is 25655983. The next prime is 25656013. The reversal of 25655987 is 78955652.

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 25655987 - 2² = 25655983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25655983) 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, 1832564 + ... + 1832577.

It is an arithmetic number, because the mean of its divisors is an integer number (7330284).

Almost surely, 2^25655987 is an apocalyptic number.

25655987 is a deficient number, since it is larger than the sum of its proper divisors (3665149).

25655987 is an equidigital number, since it uses as much as digits as its factorization.

25655987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3665148.

The product of its digits is 756000, while the sum is 47.

The square root of 25655987 is about 5065.1739358091. The cubic root of 25655987 is about 294.9372154042.

The spelling of 25655987 in words is "twenty-five million, six hundred fifty-five thousand, nine hundred eighty-seven".