25759987 has 4 divisors (see below), whose sum is σ = 28101816. Its totient is φ = 23418160.

The previous prime is 25759939. The next prime is 25759997. The reversal of 25759987 is 78995752.

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 25759987 - 2¹⁹ = 25235699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25759997) 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 in 3 ways as a sum of consecutive naturals, for example, 1170898 + ... + 1170919.

It is an arithmetic number, because the mean of its divisors is an integer number (7025454).

Almost surely, 2^25759987 is an apocalyptic number.

25759987 is a deficient number, since it is larger than the sum of its proper divisors (2341829).

25759987 is a wasteful number, since it uses less digits than its factorization.

25759987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341828.

The product of its digits is 1587600, while the sum is 52.

The square root of 25759987 is about 5075.4297355002. The cubic root of 25759987 is about 295.3352007054.

The spelling of 25759987 in words is "twenty-five million, seven hundred fifty-nine thousand, nine hundred eighty-seven".